CVE-2020-19491: There is an invalid memory access bug in cgif.c that leads to a Segmentation fault in sam2p 0.49.4

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HIGH 7.8DOWNGRADE

CVE-2020-19491 is a high-severity flaw (CVSS 7.8) affecting sam2p. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

There is an invalid memory access bug in cgif.c that leads to a Segmentation fault in sam2p 0.49.4. A crafted input will lead to a denial of service or possibly unspecified other impact.

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	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-07-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sam2p project

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

Am I affected?

Timeline

2021-07-21 18:15 UTCPublished CVE record published
2026-06-17 02:59 UTCUpdated Record last modified

sam2p project sam2p DOWNGRADE

Affected: 0.49.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.49.4

1. Check installed version

apt-cache policy sam2p || rpm -q sam2p || sam2p --version

2. No fixed release: DOWNGRADE to a release before 0.49.4 (Debian / Ubuntu)

apt-cache madison sam2p sudo apt install sam2p=<VERSION_BEFORE_0.49.4> sudo apt-mark hold sam2p

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

dnf --showduplicates list sam2p sudo dnf downgrade sam2p-<VERSION_BEFORE_0.49.4> sudo dnf versionlock add sam2p

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.

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-2020-19491?

sam2p: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-19491 being exploited?

CVE-2020-19491 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-2020-19491 affect?

CVE-2020-19491 affects sam2p. Severity is high (CVSS 7.8). There is an invalid memory access bug in cgif.c that leads to a Segmentation fault in sam2p 0.49.4. A crafted input will lead to a denial of service or possibly unspecified other impact.

How urgent is CVE-2020-19491?

Priority 48/100. High severity; Public exploit reference

Related CVEs

CVE-2020-19492 HIGH 7.8 DOWNGRADE There is a floating point exception in ReadImage that leads to a Segmentation fault in sam2p 0.49.4
CVE-2018-7554 CRITICAL 9.8 DOWNGRADE MITIGATE There is an invalid free in ReadImage in input-bmp.ci that leads to a Segmentation fault in sam2p 0.49.4
CVE-2018-7553 CRITICAL 9.8 DOWNGRADE MITIGATE There is a heap-based buffer overflow in the pcxLoadRaster function of in_pcx.cpp in sam2p 0.49.4
CVE-2018-7552 CRITICAL 9.8 DOWNGRADE MITIGATE There is an invalid free in Mapping::DoubleHash::clear in mapping.cpp that leads to a Segmentation fault in sa
CVE-2018-7551 CRITICAL 9.8 DOWNGRADE MITIGATE There is an invalid free in MiniPS::delete0 in minips.cpp that leads to a Segmentation fault in sam2p 0.49.4

References

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