CVE-2021-30499: A flaw was found in libcaca

This month

HIGH 7.8MITIGATEMITIGATE

CVE-2021-30499 is a high-severity flaw (CVSS 7.8) affecting libcaca, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2021-05-27
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · libcaca project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-27 00:15 UTCPublished CVE record published
2026-06-17 03:50 UTCUpdated Record last modified

libcaca project libcaca MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libcaca || rpm -q libcaca || libcaca --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

fedoraproject fedora MITIGATE

Affected: 34 · 35 · 36

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-30499?

libcaca: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-30499 being exploited?

CVE-2021-30499 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-30499 affect?

CVE-2021-30499 affects libcaca, fedora. Severity is high (CVSS 7.8). 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.

How urgent is CVE-2021-30499?

Priority 50/100. High severity; Public exploit reference

Related CVEs

CVE-2022-0856 MEDIUM 6.5 DOWNGRADE MITIGATE libcaca is affected by a Divide By Zero issue via img2txt, which allows a remote malicious user to cause a Den
CVE-2021-3410 HIGH 7.8 DOWNGRADE MITIGATE A flaw was found in libcaca v0.99.beta19
CVE-2021-30498 HIGH 7.8 DOWNGRADE MITIGATE A flaw was found in libcaca

References

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