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Fencer Vulns
high 7.8

CVE-2021-30499 json

A flaw was found in libcaca.

published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17420

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

A flaw was found in libcaca. A buffer overflow of export.c in function export_troff might lead to memory corruption and other potential consequences.

Patch / fix

  • libcaca Debian 14, Debian 13, Debian 12 0.99.beta19-3

debian advisories DEBIAN-CVE-2021-30499

  • libcaca Ubuntu 18.04 LTS 0.99.beta19-2ubuntu0.18.04.3
  • libcaca Ubuntu 20.04 LTS 0.99.beta19-2.1ubuntu1.20.04.2
  • libcaca Ubuntu 22.04 LTS 0.99.beta19-2.2ubuntu3
  • libcaca Ubuntu Pro 14.04 LTS 0.99.beta18-1ubuntu5.1+esm2
  • libcaca Ubuntu Pro 16.04 LTS 0.99.beta19-2ubuntu0.16.04.2+esm1

ubuntu advisories UBUNTU-CVE-2021-30499

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

  • libcaca SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 0.99.beta13b-49.3.1
  • libcaca SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +11 more 0.99.beta18-14.6.1
  • libcaca SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +8 more 0.99.beta19.git20171003-11.3.1
  • libcaca SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 0.99.beta19.git20171003-3.8.1

suse advisories SUSE-SU-2022:14909-1SUSE-SU-2022:0820-1SUSE-SU-2022:0769-1SUSE-SU-2022:0754-1

  • libcaca openSUSE Leap 15.3 0.99.beta19.git20171003-11.3.1

opensuse advisories openSUSE-SU-2022:0769-1

  • libcaca Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 0.99_beta20-r0

alpine advisories ALPINE-CVE-2021-30499

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

  • libcaca Arch Linux 0.99.beta19-5

arch linux advisories AVG-1806

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-2021-30499 updated cvss 8.1

libcaca: Global buffer overflow of export.c in function export_troff

  • 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

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/cacalabs/libcaca/issues/54 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a libcaca

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

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.