CVE-2009-0591

Status: ModifiedLow (2.6)—
The CMS_verify function in OpenSSL 0.9.8h through 0.9.8j, when CMS is enabled, does not properly handle errors associated with malformed signed attributes, which allows remote attackers to repudiate a signature that originally appeared to be valid but was actually invalid.
CVSS

Version: 2.0
Vector: AV:N/AC:H/Au:N/C:N/I:P/A:N
Base score: 2.6
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 2.73%
Percentile among all scored CVEs: 86
Score date: 10/7/2026
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)

Openssl — Openssl
CWEs

CWE-287
References

Raw JSON (NVD)

Show
{
  "id": "CVE-2009-0591",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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  ],
  "published": "2009-03-27T16:30:01.920",
  "references": [
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      "url": "http://www.osvdb.org/52865",
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      "url": "http://www.php.net/archive/2009.php#id2009-04-08-1",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The CMS_verify function in OpenSSL 0.9.8h through 0.9.8j, when CMS is enabled, does not properly handle errors associated with malformed signed attributes, which allows remote attackers to repudiate a signature that originally appeared to be valid but was actually invalid."
    },
    {
      "lang": "es",
      "value": "La función CMS_verify en OpenSSL v0.9.8h hasta v0.9.8j, cuando se ha habilitado CMS, no maneja adecuadamente los errores asociados con atributos firmados malformados, permitiendo a atacantes remotos rechazar una firma que originalmente aparentaba ser válida pero que realmente será inválida."
    }
  ],
  "lastModified": "2026-06-16T23:05:22.593",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openssl:openssl:0.9.8h:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "261EE631-AB43-44FE-B02A-DFAAB8D35927"
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:0.9.8i:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA0E0BBF-D0BE-41A7-B9BB-C28F01000BC0"
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:0.9.8j:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1A1365ED-4651-4AB2-A64B-43782EA2F0E8"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "vendorComments": [
    {
      "comment": "Not vulnerable. This issue affected OpenSSL CMS functionality which is not present in the openssl packages as shipped with Red Hat Enterprise Linux 2.1, 3, 4 or 5.",
      "lastModified": "2009-03-30T00:00:00",
      "organization": "Red Hat"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com"
}