Vulnerability-Lookup

FKIE_CVE-2026-2968

Vulnerability from fkie_nvd - Published: 2026-02-23 04:16 - Updated: 2026-02-23 20:17

Severity ?

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

References

URL	Tags
cna@vuldb.com	https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md	Exploit, Third Party Advisory
cna@vuldb.com	https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc	Exploit, Third Party Advisory
cna@vuldb.com	https://vuldb.com/?ctiid.347335	Permissions Required, VDB Entry
cna@vuldb.com	https://vuldb.com/?id.347335	Third Party Advisory, VDB Entry
cna@vuldb.com	https://vuldb.com/?submit.757091	Third Party Advisory, VDB Entry

Impacted products

	Vendor	Product	Version
	cesanta	mongoose	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83B5780A-1BF9-4983-A2BD-0E278131D841",
              "versionEndIncluding": "7.20",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 una vulnerabilidad en Cesanta Mongoose hasta 7.20 que afecta a la funci\u00f3n mg_chacha20_poly1305_decrypt del archivo /src/tls_chacha20.c del componente Gestor de Etiquetas de Autenticaci\u00f3n Poly1305. Si se manipula se puede lograr una verificaci\u00f3n impropia de la firma criptogr\u00e1fica. El ataque puede lanzarse en remoto. Este ataque se caracteriza por una alta complejidad y es dif\u00edcil de explotar. El exploit ahora es p\u00fablico y puede ser usado. El proveedor fue contactado con anterioridad sobre esta divulgaci\u00f3n, pero no respondi\u00f3 de ninguna manera."
    }
  ],
  "id": "CVE-2026-2968",
  "lastModified": "2026-02-23T20:17:23.503",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.6,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 4.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "cna@vuldb.com",
        "type": "Secondary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 1.4,
        "source": "cna@vuldb.com",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "cna@vuldb.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-02-23T04:16:02.283",
  "references": [
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Permissions Required",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/?ctiid.347335"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/?id.347335"
    },
    {
      "source": "cna@vuldb.com",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "https://vuldb.com/?submit.757091"
    }
  ],
  "sourceIdentifier": "cna@vuldb.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        },
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "cna@vuldb.com",
      "type": "Primary"
    }
  ]
}

CVE-2026-2968 (GCVE-0-2026-2968)

Vulnerability from cvelistv5 – Published: 2026-02-23 03:02 – Updated: 2026-02-23 17:26 X_Open Source

Title

Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification

Summary

Severity ?

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

3.7 (Low)


                        
                          CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

CWE

CWE-347 - Improper Verification of Cryptographic Signature
CWE-345 - Insufficient Verification of Data Authenticity

Assigner

VulDB

References

URL

Tags

	https://vuldb.com/?id.347335	vdb-entrytechnical-description
	https://vuldb.com/?ctiid.347335	signaturepermissions-required
	https://vuldb.com/?submit.757091	third-party-advisory
	https://github.com/dwBruijn/CVEs/blob/main/Mongoo…	related
	https://github.com/dwBruijn/CVEs/blob/main/Mongoo…	exploit

Impacted products

	Vendor	Product	Version
	Cesanta	Mongoose	Affected: 7.0 Affected: 7.1 Affected: 7.2 Affected: 7.3 Affected: 7.4 Affected: 7.5 Affected: 7.6 Affected: 7.7 Affected: 7.8 Affected: 7.9 Affected: 7.10 Affected: 7.11 Affected: 7.12 Affected: 7.13 Affected: 7.14 Affected: 7.15 Affected: 7.16 Affected: 7.17 Affected: 7.18 Affected: 7.19 Affected: 7.20 cpe:2.3:a:cesanta:mongoose::::::::

Credits

dwbruijn (VulDB User)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2968",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-23T17:26:42.762866Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-23T17:26:53.648Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Poly1305 Authentication Tag Handler"
          ],
          "product": "Mongoose",
          "vendor": "Cesanta",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "status": "affected",
              "version": "7.3"
            },
            {
              "status": "affected",
              "version": "7.4"
            },
            {
              "status": "affected",
              "version": "7.5"
            },
            {
              "status": "affected",
              "version": "7.6"
            },
            {
              "status": "affected",
              "version": "7.7"
            },
            {
              "status": "affected",
              "version": "7.8"
            },
            {
              "status": "affected",
              "version": "7.9"
            },
            {
              "status": "affected",
              "version": "7.10"
            },
            {
              "status": "affected",
              "version": "7.11"
            },
            {
              "status": "affected",
              "version": "7.12"
            },
            {
              "status": "affected",
              "version": "7.13"
            },
            {
              "status": "affected",
              "version": "7.14"
            },
            {
              "status": "affected",
              "version": "7.15"
            },
            {
              "status": "affected",
              "version": "7.16"
            },
            {
              "status": "affected",
              "version": "7.17"
            },
            {
              "status": "affected",
              "version": "7.18"
            },
            {
              "status": "affected",
              "version": "7.19"
            },
            {
              "status": "affected",
              "version": "7.20"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "dwbruijn (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 3.7,
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
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            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 2.6,
            "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-347335 | Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification",
          "tags": [
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            "technical-description"
          ],
          "url": "https://vuldb.com/?id.347335"
        },
        {
          "name": "VDB-347335 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/?ctiid.347335"
        },
        {
          "name": "Submit #757091 | Cesanta Mongoose Embedded Web Server 7.20 Improper Verification of Cryptographic Signature",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/?submit.757091"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/dwBruijn/CVEs/blob/main/Mongoose/ChaCha20Poly1305.md#poc"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-02-22T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-02-22T01:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-02-22T09:02:39.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-2968",
    "datePublished": "2026-02-23T03:02:07.673Z",
    "dateReserved": "2026-02-22T07:57:31.932Z",
    "dateUpdated": "2026-02-23T17:26:53.648Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

FKIE_CVE-2026-2968

CVE-2026-2968 (GCVE-0-2026-2968)

Tags

Sightings

Nomenclature