‹ Back to list

CVE-2011-3273

Status: ModifiedHigh (7.8)—
Severity7.8High · CVSS 2.0
Exploitation probability1.77 %higher than 78% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Memory leak in Cisco IOS 15.0 through 15.1, when IPS or Zone-Based Firewall (aka ZBFW) is configured, allows remote attackers to cause a denial of service (memory consumption or device crash) via vectors that trigger many session creation flows, aka Bug ID CSCti79848.

CVSS

Base score
7.8
Version
2.0
Vector
AV:N/AC:L/Au:N/C:N/I:N/A:C

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
1.77 %
Percentile among all scored CVEs
78
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-2011-3273",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "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": "2011-10-03T23:55:03.673",
  "references": [
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=24123",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=24123",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memory leak in Cisco IOS 15.0 through 15.1, when IPS or Zone-Based Firewall (aka ZBFW) is configured, allows remote attackers to cause a denial of service (memory consumption or device crash) via vectors that trigger many session creation flows, aka Bug ID CSCti79848."
    },
    {
      "lang": "es",
      "value": "Fallo de memoria en Cisco IOS v15.0 hasta v15.1, cuando un IPS o Cortafuegos Zone-Based (también conocido como ZBFW) es configurado, permite a atacantes remotos provocar una denegación de servicio (agotamiento de memoria o caída del dispositivo) a través de vectores que disparan varias sesiones de creación de hilos, también conocido como Bug ID CSCti79848."
    }
  ],
  "lastModified": "2026-06-16T23:33:00.617",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CF87CC9A-1AF5-4DB4-ACE5-DB938D3B2F84"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0m:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3D03374C-7EF0-4455-839E-09CA4F2E85BC"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0sg:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "58870B6A-55D2-4BFA-89F9-9332205CC130"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0xa:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EC6EF56C-032C-43F6-A979-E18BEA0E16A6"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.0xo:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "61D28B5C-F578-47E1-A8AC-A79D8A7F340C"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EB41294E-F3DF-4F1E-A4C8-E90B21A88836"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1gc:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B8665036-2C40-498A-B022-F6DA288D1581"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1m:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0F2359A4-8494-4BBA-85E5-C4E66D9362CE"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1s:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8A9B1D5E-02CA-4949-8ACB-9B40642816B6"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1t:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5FAFA073-B16F-475F-B68D-8FE9135AB0A4"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:15.1xb:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "34137E45-7EC0-4350-9F6D-B427CE07D693"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}