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Fencer Vulns
medium 5.5

CVE-2021-45429 json

A Buffer Overflow vulnerablity exists in VirusTotal YARA git commit: 605b2edf07ed8eb9a2c61ba22eb2e7c362f47ba7 via yr_set_configuration in y…

published 2022-02-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-32200

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

A Buffer Overflow vulnerablity exists in VirusTotal YARA git commit: 605b2edf07ed8eb9a2c61ba22eb2e7c362f47ba7 via yr_set_configuration in yara/libyara/libyara.c, which could cause a Denial of Service.

Patch / fix

  • yara Debian 14, Debian 13, Debian 12 4.2.0-1

debian advisories DEBIAN-CVE-2021-45429

  • yara Ubuntu Pro 18.04 LTS 3.7.1-1ubuntu2+esm1
  • yara Ubuntu Pro 20.04 LTS 3.9.0-1ubuntu0.1~esm1
  • yara Ubuntu Pro 22.04 LTS 4.1.3-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-45429

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • yara Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 4.2.0-r0

alpine advisories ALPINE-CVE-2021-45429

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2021-45429 updated cvss 6.6

yara: A Buffer Overflow vulnerablity exists in YARA

  • Red Hat All currently supported Red Hat products
    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

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/VirusTotal/yara/issues/1616 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

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.