Security advisory

{
  "id": "3916657a45498f66247021729604a00f55d5dab064a58f2e45874df6e9f62504",
  "url": "https://osv.dev/vulnerability/CVE-2020-27743",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27743",
    "summary": "libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.",
    "evidence": "osv:CVE-2020-27743",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-27743",
      "aliases": [
        "CVE-2020-27743"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kravietz/pam_tacplus",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a21b05c1fe7ce99aa0ee01809c69b878ba90b122"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:pam_tacplus_project:pam_tacplus:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.5.1",
            "v1.5.0-beta.1",
            "v1.4.1",
            "1.3.9",
            "1.3.8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27743.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:00.581490438Z",
      "provider": "osv",
      "references": [
        "https://github.com/kravietz/pam_tacplus/pull/163",
        "https://tools.ietf.org/html/rfc8907"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-27743",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384140,
  "published_at": "2020-10-26T22:15:13.203+00:00"
}