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CVE-2012-3924

Status: ModifiedLow (3.5)—
Severity3.5Low · CVSS 2.0
Exploitation probability0.86 %higher than 58% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The SSLVPN implementation in Cisco IOS 15.1 and 15.2, when DTLS is enabled, does not properly handle certain outbound ACL configurations, which allows remote authenticated users to cause a denial of service (device crash) via a session involving a PPP over ATM (PPPoA) interface, aka Bug ID CSCty97961.

CVSS

Base score
3.5
Version
2.0
Vector
AV:N/AC:M/Au:S/C:N/I:N/A:P

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.86 %
Percentile among all scored CVEs
58
Score date
10/21/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Cisco — IOS

CWEs

References

Show 4 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2012-3924",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:P",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2012-09-16T10:34:51.440",
  "references": [
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_2m_and_t/release/notes/152-1TCAVS.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/78672",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/docs/ios/15_2m_and_t/release/notes/152-1TCAVS.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/78672",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The SSLVPN implementation in Cisco IOS 15.1 and 15.2, when DTLS is enabled, does not properly handle certain outbound ACL configurations, which allows remote authenticated users to cause a denial of service (device crash) via a session involving a PPP over ATM (PPPoA) interface, aka Bug ID CSCty97961."
    },
    {
      "lang": "es",
      "value": "La implementación de SSLVPN en Cisco IOS v15.1 y v15.2, cuando DTLS está activada, no controla correctamente ciertas configuraciones de las listas de controla de acceso (ACL) salientes, lo que permite a usuarios remotos autenticados provocar una denegación de servicio (caída de dispositivo) a través de una sesión que implica al interface PPP sobre ATM (PPPoA), también conocido como Bug ID CSCty97961."
    }
  ],
  "lastModified": "2026-06-16T23:44:05.720",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EB41294E-F3DF-4F1E-A4C8-E90B21A88836"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C2AB6A02-B7C7-48D1-8857-BD1CDF9A40D8"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}