CVE-2025-68160

Published Jan 27, 2026

Last updated 3 months ago

CVSS medium 4.7

Overview

Description: Issue summary: Writing large, newline-free data into a BIO chain using the line-buffering filter where the next BIO performs short writes can trigger a heap-based out-of-bounds write. Impact summary: This out-of-bounds write can cause memory corruption which typically results in a crash, leading to Denial of Service for an application. The line-buffering BIO filter (BIO_f_linebuffer) is not used by default in TLS/SSL data paths. In OpenSSL command-line applications, it is typically only pushed onto stdout/stderr on VMS systems. Third-party applications that explicitly use this filter with a BIO chain that can short-write and that write large, newline-free data influenced by an attacker would be affected. However, the circumstances where this could happen are unlikely to be under attacker control, and BIO_f_linebuffer is unlikely to be handling non-curated data controlled by an attacker. For that reason the issue was assessed as Low severity. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the BIO implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue.
Source: openssl-security@openssl.org
NVD status: Analyzed
Products: openssl

Risk scores

CVSS 3.1

Type: Secondary
Base score: 4.7
Impact score: 3.6
Exploitability score: 1
Vector string: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity: MEDIUM

Weaknesses

openssl-security@openssl.org: CWE-787

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "6A8EC60C-05EC-4886-8C82-63AEF4BDA8D5",
            "versionEndExcluding": "1.0.2zn",
            "versionStartIncluding": "1.0.2",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "E000B986-6A31-468F-9EA3-B9D16DB16FB2",
            "versionEndExcluding": "1.1.1ze",
            "versionStartIncluding": "1.1.1",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "C76C5F55-5243-4461-82F5-2FEBFF4D59FA",
            "versionEndExcluding": "3.0.19",
            "versionStartIncluding": "3.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "F5292E9E-6B50-409F-9219-7B0A04047AD8",
            "versionEndExcluding": "3.3.6",
            "versionStartIncluding": "3.3.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "B9D3DCAE-317D-4DFB-93F0-7A235A229619",
            "versionEndExcluding": "3.4.4",
            "versionStartIncluding": "3.4.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "1CAC7CBE-EC03-4089-938A-0CEEB2E09B62",
            "versionEndExcluding": "3.5.5",
            "versionStartIncluding": "3.5.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "68352537-5E99-4F4D-B78A-BCF0353A70A5",
            "versionEndExcluding": "3.6.1",
            "versionStartIncluding": "3.6.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References