wolfssl — security advisory

{
  "id": "66bb26bbd7a0304f00482da53f050ae09f530bcd022ec8d5bfbb67c593b91fd3",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-12457",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2020-12457",
    "summary": "An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.",
    "evidence": "osv:DEBIAN-CVE-2020-12457",
    "products": [
      {
        "name": {
          "value": "wolfssl",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.5.0+dfsg-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "wolfssl",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.5.0+dfsg-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2020-12457",
      "aliases": [
        "DEBIAN-CVE-2020-12457"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.5.0+dfsg-1"
                }
              ]
            }
          ],
          "package": {
            "name": "wolfssl",
            "purl": "pkg:deb/debian/wolfssl?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-12457.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.5.0+dfsg-1"
                }
              ]
            }
          ],
          "package": {
            "name": "wolfssl",
            "purl": "pkg:deb/debian/wolfssl?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-12457.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-26T12:01:33.662000076Z",
      "provider": "osv",
      "upstream": [
        "CVE-2020-12457"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2020-12457"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2020-12457",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 451717,
  "published_at": "2020-08-21T14:15:10.997+00:00"
}