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Fencer Vulns
high 7.5

CVE-2021-4076 json

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

published 2022-03-02 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33968

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

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

Patch / fix

  • tang_project tang 11
  • tang Debian 14, Debian 13, Debian 12 11-1

debian advisories DEBIAN-CVE-2021-4076

  • tang Arch Linux 11-1

arch linux advisories AVG-2635

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-4076 updated cvss 7.5

tang: private key leak

  • Red Hat Enterprise Linux 7 tang, tang-nagios Red Hat Enterprise Linux 8 tang Red Hat Enterprise Linux 9 tang
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.56% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a tang

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.