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CVE-2026-20027 (GCVE-0-2026-20027)

Vulnerability from cvelistv5 – Published: 2026-01-07 16:23 – Updated: 2026-02-12 18:48
VLAI
Title
Cisco Snort DCERPC Stub Data Out of Bounds Read
Summary
Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer out-of-bounds read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to obtain sensitive information in the Snort 3 data stream.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-07 16:50 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Impacted products
Vendor Product Version CPE status
Cisco Cisco Secure Firewall Threat Defense (FTD) Software Affected: 7.0.0
Affected: 7.0.0.1
Affected: 7.0.1
Affected: 7.1.0
Affected: 7.0.1.1
Affected: 7.1.0.1
Affected: 7.0.2
Affected: 7.2.0
Affected: 7.0.2.1
Affected: 7.0.3
Affected: 7.1.0.2
Affected: 7.2.0.1
Affected: 7.0.4
Affected: 7.2.1
Affected: 7.0.5
Affected: 7.3.0
Affected: 7.2.2
Affected: 7.2.3
Affected: 7.3.1
Affected: 7.1.0.3
Affected: 7.2.4
Affected: 7.0.6
Affected: 7.2.5
Affected: 7.2.4.1
Affected: 7.3.1.1
Affected: 7.4.0
Affected: 7.0.6.1
Affected: 7.2.5.1
Affected: 7.4.1
Affected: 7.2.6
Affected: 7.0.6.2
Affected: 7.4.1.1
Affected: 7.2.7
Affected: 7.2.5.2
Affected: 7.3.1.2
Affected: 7.2.8
Affected: 7.6.0
Affected: 7.4.2
Affected: 7.2.8.1
Affected: 7.0.6.3
Affected: 7.4.2.1
Affected: 7.2.9
Affected: 7.0.7
Affected: 7.7.0
Affected: 7.4.2.2
Affected: 7.2.10
Affected: 7.6.1
Affected: 7.4.2.3
Affected: 7.0.8
Affected: 7.6.2
Affected: 7.7.10
Affected: 7.0.8.1
Affected: 7.6.2.1
Affected: 7.7.10.1
Affected: 7.4.2.4
Affected: 7.2.10.2
Affected: 7.4.3
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Cisco Cisco UTD SNORT IPS Engine Software Affected: 3.17.1S
Affected: 16.12.3
Affected: Fuji-16.9.5
Affected: 16.12.4
Affected: 17.3.1a
Affected: 16.6.6
Affected: 16.12.2
Affected: Fuji-16.9.6
Affected: 3.17.0S
Affected: Fuji-16.9.3
Affected: Denali-16.3.7
Affected: Fuji-16.9.2
Affected: Fuji-16.9.4
Affected: Everest-16.6.4
Affected: Everest-16.6.3
Affected: 16.6.5
Affected: Denali-16.3.5
Affected: 17.2.1r
Affected: 17.1.1
Affected: Everest-16.6.2
Affected: 16.6.7a
Affected: Denali-16.3.4
Affected: 16.6.1
Affected: Denali-16.3.9
Affected: Denali-16.3.3
Affected: 16.12.1a
Affected: 17.3.2
Affected: 17.4.1a
Affected: 16.12.5
Affected: 17.5.1
Affected: Fuji-16.9.7
Affected: 16.6.9
Affected: 17.3.3
Affected: 17.5.1a
Affected: 17.3.4
Affected: 17.3.4a
Affected: 17.4.2
Affected: 17.4.1b
Affected: 17.6.1a
Affected: 16.6.10
Affected: 17.7.1a
Affected: 16.12.6
Affected: Fuji-16.9.8
Affected: 17.6.2
Affected: 17.8.1a
Affected: 16.12.7
Affected: 17.3.5
Affected: 17.6.3
Affected: 17.6.3a
Affected: 17.7.2
Affected: 17.9.1a
Affected: 17.6.4
Affected: 17.10.1a
Affected: 17.3.6
Affected: 16.12.8
Affected: 17.3.7
Affected: 17.9.2a
Affected: 17.6.5
Affected: 17.11.1a
Affected: 17.9.3a
Affected: 17.12.1a
Affected: 17.9.4
Affected: 17.6.6
Affected: 17.3.8
Affected: 17.3.8a
Affected: 17.6.6a
Affected: 17.9.4a
Affected: 17.12.2
Affected: 17.13.1a
Affected: 17.9.5a
Affected: 17.12.3
Affected: 17.6.7
Affected: 17.14.1a
Affected: 17.12.4
Affected: 17.12.3a
Affected: 17.15.1a
Affected: 17.6.8
Affected: 17.9.6
Affected: 17.6.8a
Affected: 17.16.1a
Affected: 17.9.5e
Affected: 17.12.4a
Affected: 17.15.2c
Affected: 17.9.5f
Affected: 17.12.4b
Affected: 17.15.2a
Affected: 17.12.5
Affected: 17.17.1
Affected: 17.12.5a
Affected: 17.9.7a
Affected: 17.15.3a
Affected: 17.15.3
Affected: 17.12.5b
Affected: 17.12.5c
Affected: 17.15.4
Affected: 17.9.7b
Affected: 17.18.1
Affected: 17.18.1a
Affected: 17.12.6
Affected: 17.9.8
Affected: 17.15.4c
Affected: 17.12.5d
Affected: 17.18.2
guessed Create a notification for this product.
Show details on NVD website

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      "descriptions": [
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          "lang": "en",
          "value": "Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer out-of-bounds read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to obtain sensitive information in the Snort 3 data stream."
        }
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      "exploits": [
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          "name": "cisco-sa-snort3-dcerpc-vulns-J9HNF4tH",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH"
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    "dateReserved": "2025-10-08T11:59:15.352Z",
    "dateUpdated": "2026-02-12T18:48:32.446Z",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
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\"17.3.8\"}, {\"status\": \"affected\", \"version\": \"17.3.8a\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.9.4a\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.13.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.5a\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"affected\", \"version\": \"17.14.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.12.3a\"}, {\"status\": \"affected\", \"version\": \"17.15.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.8\"}, {\"status\": \"affected\", \"version\": \"17.9.6\"}, {\"status\": \"affected\", \"version\": \"17.6.8a\"}, {\"status\": \"affected\", \"version\": \"17.16.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.5e\"}, {\"status\": \"affected\", \"version\": \"17.12.4a\"}, {\"status\": \"affected\", \"version\": \"17.15.2c\"}, {\"status\": \"affected\", \"version\": \"17.9.5f\"}, {\"status\": \"affected\", \"version\": \"17.12.4b\"}, {\"status\": \"affected\", \"version\": \"17.15.2a\"}, {\"status\": \"affected\", \"version\": \"17.12.5\"}, {\"status\": \"affected\", \"version\": \"17.17.1\"}, {\"status\": \"affected\", \"version\": \"17.12.5a\"}, {\"status\": \"affected\", \"version\": \"17.9.7a\"}, {\"status\": \"affected\", \"version\": \"17.15.3a\"}, {\"status\": \"affected\", \"version\": \"17.15.3\"}, {\"status\": \"affected\", \"version\": \"17.12.5b\"}, {\"status\": \"affected\", \"version\": \"17.12.5c\"}, {\"status\": \"affected\", \"version\": \"17.15.4\"}, {\"status\": \"affected\", \"version\": \"17.9.7b\"}, {\"status\": \"affected\", \"version\": \"17.18.1\"}, {\"status\": \"affected\", \"version\": \"17.18.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.6\"}, {\"status\": \"affected\", \"version\": \"17.9.8\"}, {\"status\": \"affected\", \"version\": \"17.15.4c\"}, {\"status\": \"affected\", \"version\": \"17.12.5d\"}, {\"status\": \"affected\", \"version\": \"17.18.2\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH\", \"name\": \"cisco-sa-snort3-dcerpc-vulns-J9HNF4tH\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.\\r\\n\\r\\nThis vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer out-of-bounds read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to obtain sensitive information in the Snort 3 data stream.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-200\", \"description\": \"Exposure of Sensitive Information to an Unauthorized Actor\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-02-12T18:48:32.446Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20027\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-12T18:48:32.446Z\", \"dateReserved\": \"2025-10-08T11:59:15.352Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-01-07T16:23:43.301Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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