FKIE_CVE-2025-71263

Vulnerability from fkie_nvd - Published: 2026-03-13 19:53 - Updated: 2026-03-21 22:16
Severity
7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
References
cve@mitre.orghttps://discuss.systems/@ricci/115747843169814700
cve@mitre.orghttps://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/
cve@mitre.orghttps://www.spinellis.gr/blog/20251223/
cve@mitre.orghttps://www.tuhs.org/pipermail/tuhs/2026-January/032991.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/03/20/6
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/03/21/4
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [
    {
      "sourceIdentifier": "cve@mitre.org",
      "tags": [
        "unsupported-when-assigned"
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the \u0027password\u0027 variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments. NOTE: This vulnerability only affects products that are no longer supported by the maintainer."
    },
    {
      "lang": "es",
      "value": "En UNIX Cuarta Edici\u00f3n de Investigaci\u00f3n (v4), el comando su es vulnerable a un desbordamiento de b\u00fafer debido a que la variable \u0027password\u0027 tiene un tama\u00f1o fijo de 100 bytes. Un usuario local puede explotar esto para obtener privilegios de root. Es poco probable que UNIX v4 se est\u00e9 ejecutando en alg\u00fan lugar fuera de un n\u00famero muy reducido de entornos de laboratorio."
    }
  ],
  "id": "CVE-2025-71263",
  "lastModified": "2026-03-21T22:16:18.207",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.4,
        "impactScore": 5.9,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-13T19:53:53.983",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://discuss.systems/@ricci/115747843169814700"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://www.spinellis.gr/blog/20251223/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/20/6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/21/4"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-120"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    }
  ]
}


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