fkie_cve-2025-4877
Vulnerability from fkie_nvd
Published
2025-08-20 13:15
Modified
2025-08-20 14:39
Severity ?
4.5 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Summary
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.
References
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-4877
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2376193
secalert@redhat.comhttps://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d
secalert@redhat.comhttps://www.libssh.org/security/advisories/CVE-2025-4877.txt
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "There\u0027s a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it\u0027s possible that the program perform out of bounds write leading to a heap corruption.\nThis issue affects only 32-bits builds of libssh."
    }
  ],
  "id": "CVE-2025-4877",
  "lastModified": "2025-08-20T14:39:07.860",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 4.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.4,
        "source": "secalert@redhat.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-08-20T13:15:28.890",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2025-4877"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376193"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11\u0026id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://www.libssh.org/security/advisories/CVE-2025-4877.txt"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Primary"
    }
  ]
}


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