swftools wav2swf wav.c wav_convert2mono out-of-bounds

published 2025-06-19 16 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-18692

cvss: 3.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

A vulnerability, which was classified as problematic, was found in swftools up to 0.9.2. This affects the function wav_convert2mono in the library lib/wav.c of the component wav2swf. The manipulation leads to out-of-bounds read. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.

Patch / fix

fixed in 1

swftools swftools 0.9.2

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 16 mo ago (2025-06-23)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/swftools/swftools/issues/239 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/user-attachments/files/19415662/wav2swf_crash.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	4.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CNA	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
CNA	3.0	3.3	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
CNA	2.0	1.7	AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
CNA	4.0	1.9	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	3.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA	2.0	1.7	AV:L/AC:L/Au:S/C:N/I:N/A:P

Affected products

n/a swftools

Classification

Weakness

CWE-125 Out-of-bounds Read
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com /swftools/swftools/issues/239
issue-tracking, exploit, third-party-advisory
github.com /user-attachments/files/19415662/wav2swf_crash.txt
exploit
vuldb.com /?id.313275
vdb-entry, technical-description, third-party-advisory
vuldb.com /?ctiid.313275
signature, permissions-required, third-party-advisory, vdb-entry
vuldb.com /?submit.593005
third-party-advisory, vdb-entry

Sources

CVE List CVE-2025-6271
NVD CVE-2025-6271

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.

Summary