CVE-2023-37644: SWFTools 0.9.2 772e55a allows attackers to trigger a large memory-allocation attempt via a crafted document, a

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-37644 is a medium-severity flaw (CVSS 5.5) affecting swftools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SWFTools 0.9.2 772e55a allows attackers to trigger a large memory-allocation attempt via a crafted document, as demonstrated by pdf2swf. This occurs in png_read_chunk in lib/png.c.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-787
Published	2024-01-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: swftools

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

Am I affected?

Timeline

2024-01-11 08:15 UTCPublished CVE record published
2026-06-17 06:08 UTCUpdated Record last modified

swftools swftools DOWNGRADE

Affected: 0.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9.2 (Debian / Ubuntu)

apt-cache madison swftools sudo apt install swftools=<VERSION_BEFORE_0.9.2> sudo apt-mark hold swftools

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

dnf --showduplicates list swftools sudo dnf downgrade swftools-<VERSION_BEFORE_0.9.2> sudo dnf versionlock add swftools

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-2023-37644?

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

Is CVE-2023-37644 being exploited?

CVE-2023-37644 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-2023-37644 affect?

CVE-2023-37644 affects swftools. Severity is medium (CVSS 5.5). SWFTools 0.9.2 772e55a allows attackers to trigger a large memory-allocation attempt via a crafted document, as demonstrated by pdf2swf. This occurs in png_read_chunk in lib/png.c.

How urgent is CVE-2023-37644?

Priority 29/100. Public exploit reference

Related CVEs

CVE-2024-28458 HIGH 7.5 DOWNGRADE Null Pointer Dereference vulnerability in swfdump in swftools 0.9.2 allows attackers to crash the appliation v
CVE-2024-26339 CRITICAL 9.1 DOWNGRADE swftools v0.9.2 was discovered to contain a strcpy parameter overlap via /home/swftools/src/swfc+0x48318a.
CVE-2024-26337 MEDIUM 4.3 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function s_font at swftools/src/swf
CVE-2024-26335 MEDIUM 5.5 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function state_free at swftools/src
CVE-2024-26334 MEDIUM 6.2 DOWNGRADE swftools v0.9.2 was discovered to contain a segmentation violation via the function compileSWFActionCode at sw

References

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