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Fencer Vulns
critical 9.1

CVE-2018-19857 json

The CAF demuxer in modules/demux/caf.c in VideoLAN VLC media player 3.0.4 may read memory from an uninitialized pointer when processing mag…

published 2018-12-05 7 y ago modified 2026-10-15 24 d ago also EUVD-2018-11532

cvss
9.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

The CAF demuxer in modules/demux/caf.c in VideoLAN VLC media player 3.0.4 may read memory from an uninitialized pointer when processing magic cookies in CAF files, because a ReadKukiChunk() cast converts a return value to an unsigned int even if that value is negative. This could result in a denial of service and/or a potential infoleak.

Patch / fix

  • vlc Debian 14, Debian 13, Debian 12 3.0.4-4

debian advisories DEBIAN-CVE-2018-19857

  • vlc Ubuntu 18.04 LTS 3.0.7.1-0ubuntu18.04.1

ubuntu advisories UBUNTU-CVE-2018-19857

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • vlc openSUSE Tumbleweed 3.0.16-1.5
  • vlc Package Hub 15 3.0.7.1-bp150.2.6.1
  • libaom Package Hub 15 1.0.0-bp150.2.1
  • vlc openSUSE Leap 15.0 3.0.7.1-lp150.8.1
  • libaom openSUSE Leap 15.0 1.0.0-lp150.2.1
  • vlc Package Hub 15 SP1 3.0.7.1-bp151.5.3.3
  • vlc openSUSE Leap 15.1 3.0.7.1-lp151.6.3.1

opensuse advisories openSUSE-SU-2024:11502-1openSUSE-SU-2019:2015-1openSUSE-SU-2019:1909-1openSUSE-SU-2019:1897-1openSUSE-SU-2019:1840-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
24 d ago

Exploit prediction

3.92% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • dyntopia.com https://dyntopia.com/advisories/013-vlc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P

Classification

Weakness
  • CWE-824 Access of Uninitialized Pointer

References

Sources

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.