ubuntu-cve-2021-4076
Vulnerability from osv_ubuntu
Published
2022-03-02 23:15
Modified
2025-07-16 04:56
Summary
Details

A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "tang",
            "binary_version": "11-1"
          },
          {
            "binary_name": "tang-common",
            "binary_version": "11-1"
          },
          {
            "binary_name": "tang-common-dbgsym",
            "binary_version": "11-1"
          },
          {
            "binary_name": "tang-xinetd",
            "binary_version": "11-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "tang",
        "purl": "pkg:deb/ubuntu/tang@11-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8-3",
        "10-3",
        "10-4"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.",
  "id": "UBUNTU-CVE-2021-4076",
  "modified": "2025-07-16T04:56:49Z",
  "published": "2022-03-02T23:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4076"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/latchset/tang/pull/81"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4076"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4076"
  ],
  "withdrawn": "2025-07-18T16:46:32Z"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.