CVE-2021-3410: A flaw was found in libcaca v0.99.beta19

This month

HIGH 7.8WATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2021-3410 is a high-severity flaw (CVSS 7.8) affecting libcaca, debian linux, 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 v0.99.beta19. A buffer overflow issue in caca_resize function in libcaca/caca/canvas.c may lead to local execution of arbitrary code in the user context.

Why this priority

High severity
Public exploit reference
On your watchlist

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	Low
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-119, CWE-190
Published	2021-02-23
Last modified	2026-06-17

Publisher (CNA): Fedora Project · Vendor: debian · 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

2021-02-23 23:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

libcaca project libcaca DOWNGRADE

Affected: 0.99 beta19

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.99

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.99 (Debian / Ubuntu)

apt-cache madison libcaca sudo apt install libcaca=<VERSION_BEFORE_0.99> sudo apt-mark hold libcaca

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libcaca sudo dnf downgrade libcaca-<VERSION_BEFORE_0.99> sudo dnf versionlock add libcaca

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

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.

fedoraproject fedora MITIGATE

Affected: 34 · 35

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-2021-3410?

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

Is CVE-2021-3410 being exploited?

CVE-2021-3410 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-2021-3410 affect?

CVE-2021-3410 affects libcaca, debian linux, fedora. Severity is high (CVSS 7.8). A flaw was found in libcaca v0.99.beta19. A buffer overflow issue in caca_resize function in libcaca/caca/canvas.c may lead to local execution of arbitrary code in the user context.

How urgent is CVE-2021-3410?

Priority 49/100. High severity; Public exploit reference; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

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CVE-2021-30499 HIGH 7.8 MITIGATE MITIGATE A flaw was found in libcaca
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References

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