Vulnerability-Lookup

GHSA-998P-WVFV-584P

Vulnerability from github – Published: 2026-09-02 18:32 – Updated: 2026-09-02 18:32

Details

This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition. Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-20281"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-02T17:17:33Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\n\nThis vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition.\u0026nbsp;A manual reboot of the device is required to recover from this condition.\nNote: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.",
  "id": "GHSA-998p-wvfv-584p",
  "modified": "2026-09-02T18:32:27Z",
  "published": "2026-09-02T18:32:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20281"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-20281 (GCVE-0-2026-20281)

Vulnerability from cvelistv5 – Published: 2026-09-02 16:14 – Updated: 2026-09-02 17:58

Title

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

Summary

A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition. Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 16:45 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

1 product

Vendor	Product	Version
Cisco	Cisco Session Initiation Protocol (SIP) Software	Affected: 12.1(1)SR1 Affected: 11.5(1) Affected: 10.3(2) Affected: 10.2(2) Affected: 10.3(1) Affected: 10.3(1)SR4 Affected: 11.0(1) Affected: 10.4(1)SR2 3rd Party Affected: 11.7(1) Affected: 12.1(1) Affected: 11.0(0.7) MPP Affected: 9.3(4) 3rd Party Affected: 12.5(1)SR2 Affected: 10.2(1)SR1 Affected: 9.3(4)SR3 3rd Party Affected: 10.2(1) Affected: 12.5(1) Affected: 10.3(1)SR2 Affected: 11-0-1MSR1-1 Affected: 10.4(1) 3rd Party Affected: 12.5(1)SR1 Affected: 11.5(1)SR1 Affected: 10.1(1)SR2 Affected: 12.0(1)SR2 Affected: 12.6(1) Affected: 10.3(1.11) 3rd Party Affected: 12.0(1) Affected: 12.0(1)SR1 Affected: 9.3(3) Affected: 12.5(1)SR3 Affected: 10.3(1)SR4b Affected: 9.3(4)SR1 3rd Party Affected: 10.3(1)SR5 Affected: 10.1(1.9) Affected: 10.3(1.9) 3rd Party Affected: 9.3(4)SR2 3rd Party Affected: 10.3(1)SR1 Affected: 10.3(1)SR3 Affected: 10.1(1)SR1 Affected: 12.0(1)SR3 Affected: 12.6(1)SR1 Affected: 12.7(1) Affected: 10.3(1)SR6 Affected: 12.8(1) Affected: 12.7(1)SR1 Affected: 11.0(2)SR1 Affected: 11.0(4) Affected: 11.0(2) Affected: 11.0(4)SR3 Affected: 11.0(5) Affected: 11.0(3)SR2 Affected: 11.0(3)SR4 Affected: 11.0(3)SR3 Affected: 11.0(2)SR2 Affected: 11.0(4)SR1 Affected: 11.0(5)SR3 Affected: 11.0(3) Affected: 11.0(5)SR2 Affected: 11.0(3)SR6 Affected: 11.0(5)SR1 Affected: 11.0(4)SR2 Affected: 11.0(3)SR1 Affected: 11.0(3)SR5 Affected: 11.0(6) Affected: 12.8(1)SR1 Affected: 12.8(1)SR2 Affected: 14.0(1) Affected: 14.0(1)SR1 Affected: 11.0(6)SR1 Affected: 10.3(1)SR7 Affected: 14.0(1)SR2 Affected: 14.1(1) Affected: 14.0(1)SR3 Affected: 11.0(6)SR2 Affected: 14.1(1)SR1 Affected: 14.1(1)SR2 Affected: 11.0(6)SR4 Affected: 14.2(1) Affected: 14.2(1)SR1 Affected: 11.0(6)SR5 Affected: 14.1(1)SR3 Affected: 14.2(1)SR2 Affected: 3.1(1) Affected: 3.0(1) Affected: 2.3(1) Affected: 2.3(1)SR1 Affected: 2.2(1) Affected: 2.1(1) Affected: 2.0(1) Affected: 14.2(1)SR3 Affected: 3.1(1)SR1 Affected: 14.3(1) Affected: 3.2(1) Affected: 14.3(1)SR1 Affected: 14.2(1)SR4 Affected: 3.3(1) Affected: 11.0(6)SR6 Affected: 14.3(1)SR2 Affected: 3.4(1) Affected: 14.3(1)SR3 Affected: 3.5(1) Affected: 11.0(6)SR7 Affected: 3.5(1)SR1 Affected: 14.4(1) Affected: 3.6(1) Affected: 4.0(1) Affected: 14.4(1)SR1 Affected: 4.1(1) Affected: 14.4(1)SR2 Affected: 4.1(1)SR1

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20281",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T16:45:26.338821Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T17:58:58.216Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco Session Initiation Protocol (SIP) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "12.1(1)SR1"
            },
            {
              "status": "affected",
              "version": "11.5(1)"
            },
            {
              "status": "affected",
              "version": "10.3(2)"
            },
            {
              "status": "affected",
              "version": "10.2(2)"
            },
            {
              "status": "affected",
              "version": "10.3(1)"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR4"
            },
            {
              "status": "affected",
              "version": "11.0(1)"
            },
            {
              "status": "affected",
              "version": "10.4(1)SR2 3rd Party"
            },
            {
              "status": "affected",
              "version": "11.7(1)"
            },
            {
              "status": "affected",
              "version": "12.1(1)"
            },
            {
              "status": "affected",
              "version": "11.0(0.7) MPP"
            },
            {
              "status": "affected",
              "version": "9.3(4) 3rd Party"
            },
            {
              "status": "affected",
              "version": "12.5(1)SR2"
            },
            {
              "status": "affected",
              "version": "10.2(1)SR1"
            },
            {
              "status": "affected",
              "version": "9.3(4)SR3 3rd Party"
            },
            {
              "status": "affected",
              "version": "10.2(1)"
            },
            {
              "status": "affected",
              "version": "12.5(1)"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR2"
            },
            {
              "status": "affected",
              "version": "11-0-1MSR1-1"
            },
            {
              "status": "affected",
              "version": "10.4(1) 3rd Party"
            },
            {
              "status": "affected",
              "version": "12.5(1)SR1"
            },
            {
              "status": "affected",
              "version": "11.5(1)SR1"
            },
            {
              "status": "affected",
              "version": "10.1(1)SR2"
            },
            {
              "status": "affected",
              "version": "12.0(1)SR2"
            },
            {
              "status": "affected",
              "version": "12.6(1)"
            },
            {
              "status": "affected",
              "version": "10.3(1.11) 3rd Party"
            },
            {
              "status": "affected",
              "version": "12.0(1)"
            },
            {
              "status": "affected",
              "version": "12.0(1)SR1"
            },
            {
              "status": "affected",
              "version": "9.3(3)"
            },
            {
              "status": "affected",
              "version": "12.5(1)SR3"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR4b"
            },
            {
              "status": "affected",
              "version": "9.3(4)SR1 3rd Party"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR5"
            },
            {
              "status": "affected",
              "version": "10.1(1.9)"
            },
            {
              "status": "affected",
              "version": "10.3(1.9) 3rd Party"
            },
            {
              "status": "affected",
              "version": "9.3(4)SR2 3rd Party"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR1"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR3"
            },
            {
              "status": "affected",
              "version": "10.1(1)SR1"
            },
            {
              "status": "affected",
              "version": "12.0(1)SR3"
            },
            {
              "status": "affected",
              "version": "12.6(1)SR1"
            },
            {
              "status": "affected",
              "version": "12.7(1)"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR6"
            },
            {
              "status": "affected",
              "version": "12.8(1)"
            },
            {
              "status": "affected",
              "version": "12.7(1)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(2)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(4)"
            },
            {
              "status": "affected",
              "version": "11.0(2)"
            },
            {
              "status": "affected",
              "version": "11.0(4)SR3"
            },
            {
              "status": "affected",
              "version": "11.0(5)"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR2"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR4"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR3"
            },
            {
              "status": "affected",
              "version": "11.0(2)SR2"
            },
            {
              "status": "affected",
              "version": "11.0(4)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(5)SR3"
            },
            {
              "status": "affected",
              "version": "11.0(3)"
            },
            {
              "status": "affected",
              "version": "11.0(5)SR2"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR6"
            },
            {
              "status": "affected",
              "version": "11.0(5)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(4)SR2"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(3)SR5"
            },
            {
              "status": "affected",
              "version": "11.0(6)"
            },
            {
              "status": "affected",
              "version": "12.8(1)SR1"
            },
            {
              "status": "affected",
              "version": "12.8(1)SR2"
            },
            {
              "status": "affected",
              "version": "14.0(1)"
            },
            {
              "status": "affected",
              "version": "14.0(1)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR1"
            },
            {
              "status": "affected",
              "version": "10.3(1)SR7"
            },
            {
              "status": "affected",
              "version": "14.0(1)SR2"
            },
            {
              "status": "affected",
              "version": "14.1(1)"
            },
            {
              "status": "affected",
              "version": "14.0(1)SR3"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR2"
            },
            {
              "status": "affected",
              "version": "14.1(1)SR1"
            },
            {
              "status": "affected",
              "version": "14.1(1)SR2"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR4"
            },
            {
              "status": "affected",
              "version": "14.2(1)"
            },
            {
              "status": "affected",
              "version": "14.2(1)SR1"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR5"
            },
            {
              "status": "affected",
              "version": "14.1(1)SR3"
            },
            {
              "status": "affected",
              "version": "14.2(1)SR2"
            },
            {
              "status": "affected",
              "version": "3.1(1)"
            },
            {
              "status": "affected",
              "version": "3.0(1)"
            },
            {
              "status": "affected",
              "version": "2.3(1)"
            },
            {
              "status": "affected",
              "version": "2.3(1)SR1"
            },
            {
              "status": "affected",
              "version": "2.2(1)"
            },
            {
              "status": "affected",
              "version": "2.1(1)"
            },
            {
              "status": "affected",
              "version": "2.0(1)"
            },
            {
              "status": "affected",
              "version": "14.2(1)SR3"
            },
            {
              "status": "affected",
              "version": "3.1(1)SR1"
            },
            {
              "status": "affected",
              "version": "14.3(1)"
            },
            {
              "status": "affected",
              "version": "3.2(1)"
            },
            {
              "status": "affected",
              "version": "14.3(1)SR1"
            },
            {
              "status": "affected",
              "version": "14.2(1)SR4"
            },
            {
              "status": "affected",
              "version": "3.3(1)"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR6"
            },
            {
              "status": "affected",
              "version": "14.3(1)SR2"
            },
            {
              "status": "affected",
              "version": "3.4(1)"
            },
            {
              "status": "affected",
              "version": "14.3(1)SR3"
            },
            {
              "status": "affected",
              "version": "3.5(1)"
            },
            {
              "status": "affected",
              "version": "11.0(6)SR7"
            },
            {
              "status": "affected",
              "version": "3.5(1)SR1"
            },
            {
              "status": "affected",
              "version": "14.4(1)"
            },
            {
              "status": "affected",
              "version": "3.6(1)"
            },
            {
              "status": "affected",
              "version": "4.0(1)"
            },
            {
              "status": "affected",
              "version": "14.4(1)SR1"
            },
            {
              "status": "affected",
              "version": "4.1(1)"
            },
            {
              "status": "affected",
              "version": "14.4(1)SR2"
            },
            {
              "status": "affected",
              "version": "4.1(1)SR1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition.\u0026nbsp;A manual reboot of the device is required to recover from this condition.\r\nNote: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-401",
              "description": "Missing Release of Memory after Effective Lifetime",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T16:14:26.432Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-phone-dos-txMYNRzv",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-txMYNRzv"
        }
      ],
      "source": {
        "advisory": "cisco-sa-phone-dos-txMYNRzv",
        "defects": [
          "CSCwu46404"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20281",
    "datePublished": "2026-09-02T16:14:26.432Z",
    "dateReserved": "2025-10-08T11:59:15.403Z",
    "dateUpdated": "2026-09-02T17:58:58.216Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-998P-WVFV-584P

CVE-2026-20281 (GCVE-0-2026-20281)

Tags

Sightings

Nomenclature