CVE-2025-68160 (GCVE-0-2025-68160)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-10-15 01:09
VLAI
Title
Heap out-of-bounds write in BIO_f_linebuffer on short writes
Summary
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.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-29 15:04 UTC
CWE
Assigner
openssl CNA under the mitre root
CNA scorecard B 78/100 over 43 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.1 (semver)
Affected: 3.5.0 , < 3.5.5 (semver)
Affected: 3.4.0 , < 3.4.4 (semver)
Affected: 3.3.0 , < 3.3.6 (semver)
Affected: 3.0.0 , < 3.0.19 (semver)
Affected: 1.1.1 , < 1.1.1ze (custom)
Affected: 1.0.2 , < 1.0.2zn (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Date Public
2026-01-27 14:00
Credits
Petr Šimeček (Aisle Research) Stanislav Fort (Aisle Research) Stanislav Fort (Aisle Research) Neil Horman
Show details on NVD website
To clipboard 

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        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "openssl-security@openssl.org",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-14T19:46:36+00:00",
      "cve": "CVE-2025-68160",
      "id": "CVE-2025-68160",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:fixed": "134",
      "product_status:known_affected": "60",
      "product_status:known_not_affected": "5",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssl: OpenSSL: Denial of Service due to out-of-bounds write in BIO filter",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68160.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "affected": [
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-05-12T12:08:39.602Z",
              "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
              "shortName": "siemens-SADP"
            },
            "references": [
              {
                "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
              }
            ],
            "x_adpType": "supplier"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "HIGH",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 4.7,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-68160",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-29T15:04:54.880991Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-29T15:05:45.180Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "OpenSSL",
              "vendor": "OpenSSL",
              "versions": [
                {
                  "lessThan": "3.6.1",
                  "status": "affected",
                  "version": "3.6.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.5.5",
                  "status": "affected",
                  "version": "3.5.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.4.4",
                  "status": "affected",
                  "version": "3.4.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.3.6",
                  "status": "affected",
                  "version": "3.3.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.0.19",
                  "status": "affected",
                  "version": "3.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "1.1.1ze",
                  "status": "affected",
                  "version": "1.1.1",
                  "versionType": "custom"
                },
                {
                  "lessThan": "1.0.2zn",
                  "status": "affected",
                  "version": "1.0.2",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "Petr \u0160ime\u010dek (Aisle Research)"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "Stanislav Fort (Aisle Research)"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Stanislav Fort (Aisle Research)"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Neil Horman"
            }
          ],
          "datePublic": "2026-01-27T14:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
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                  "type": "text/html",
                  "value": "Issue summary: Writing large, newline-free data into a BIO chain using the\u003cbr\u003eline-buffering filter where the next BIO performs short writes can trigger\u003cbr\u003ea heap-based out-of-bounds write.\u003cbr\u003e\u003cbr\u003eImpact summary: This out-of-bounds write can cause memory corruption which\u003cbr\u003etypically results in a crash, leading to Denial of Service for an application.\u003cbr\u003e\u003cbr\u003eThe line-buffering BIO filter (BIO_f_linebuffer) is not used by default in\u003cbr\u003eTLS/SSL data paths. In OpenSSL command-line applications, it is typically\u003cbr\u003eonly pushed onto stdout/stderr on VMS systems. Third-party applications that\u003cbr\u003eexplicitly use this filter with a BIO chain that can short-write and that\u003cbr\u003ewrite large, newline-free data influenced by an attacker would be affected.\u003cbr\u003eHowever, the circumstances where this could happen are unlikely to be under\u003cbr\u003eattacker control, and BIO_f_linebuffer is unlikely to be handling non-curated\u003cbr\u003edata controlled by an attacker. For that reason the issue was assessed as\u003cbr\u003eLow severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\u003cbr\u003eas the BIO implementation is outside the OpenSSL FIPS module boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue."
                }
              ],
              "value": "Issue summary: Writing large, newline-free data into a BIO chain using the\nline-buffering filter where the next BIO performs short writes can trigger\na heap-based out-of-bounds write.\n\nImpact summary: This out-of-bounds write can cause memory corruption which\ntypically results in a crash, leading to Denial of Service for an application.\n\nThe line-buffering BIO filter (BIO_f_linebuffer) is not used by default in\nTLS/SSL data paths. In OpenSSL command-line applications, it is typically\nonly pushed onto stdout/stderr on VMS systems. Third-party applications that\nexplicitly use this filter with a BIO chain that can short-write and that\nwrite large, newline-free data influenced by an attacker would be affected.\nHowever, the circumstances where this could happen are unlikely to be under\nattacker control, and BIO_f_linebuffer is unlikely to be handling non-curated\ndata controlled by an attacker. For that reason the issue was assessed as\nLow severity.\n\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\nas the BIO implementation is outside the OpenSSL FIPS module boundary.\n\nOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue."
            }
          ],
          "metrics": [
            {
              "format": "other",
              "other": {
                "content": {
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                },
                "type": "https://openssl-library.org/policies/general/security-policy/"
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          ],
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                  "cweId": "CWE-787",
                  "description": "CWE-787 Out-of-bounds Write",
                  "lang": "en",
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            "dateUpdated": "2026-01-27T16:01:23.181Z",
            "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
            "shortName": "openssl"
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          "references": [
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              "name": "OpenSSL Advisory",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://openssl-library.org/news/secadv/20260127.txt"
            },
            {
              "name": "3.6.1 git commit",
              "tags": [
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              ],
              "url": "https://github.com/openssl/openssl/commit/4c96fbba618e1940f038012506ee9e21d32ee12c"
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              "url": "https://github.com/openssl/openssl/commit/6845c3b6460a98b1ec4e463baa2ea1a63a32d7c0"
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              "name": "3.4.4 git commit",
              "tags": [
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              ],
              "url": "https://github.com/openssl/openssl/commit/68a7cd2e2816c3a02f4d45a2ce43fc04fac97096"
            },
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              "name": "3.3.6 git commit",
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              ],
              "url": "https://github.com/openssl/openssl/commit/384011202af92605d926fafe4a0bcd6b65d162ad"
            },
            {
              "name": "3.0.19 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/475c466ef2fbd8fc1df6fae1c3eed9c813fc8ff6"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Heap out-of-bounds write in BIO_f_linebuffer on short writes",
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      },
      "cveMetadata": {
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "assignerShortName": "openssl",
        "cveId": "CVE-2025-68160",
        "datePublished": "2026-01-27T16:01:23.181Z",
        "dateReserved": "2025-12-16T09:20:53.257Z",
        "dateUpdated": "2026-05-12T12:08:39.602Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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