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CVE-2021-25804

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of...

7.5 HighPublic exploitFix available

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.81%Up 1.3 points since Jul 27, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
CVE-2021-25804
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
CVE-2021-25804
Updated
2026-11-02
EUVDEUVD-2021-12687 No score

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
EUVD-2021-12687
Updated
2026-11-03
GitHub AdvisoriesGHSA-qpmj-gfg7-c4vm No score

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of...

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
GHSA-qpmj-gfg7-c4vm
Weakness
CWE-476
Updated
2026-11-02
OSV 7.5

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
CVE-2021-25804
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-25804 7.5

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
DEBIAN-CVE-2021-25804
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-25804 7.5

A NULL-pointer dereference in "Open" in avi.c of VideoLAN VLC Media Player 3.0.11 can a denial of service (DOS) in the application.

Record
UBUNTU-CVE-2021-25804
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUSN-6180-1 No score

vlc vulnerabilities

It was discovered that VLC could be made to read out of bounds when decoding image files. If a user were tricked into opening a crafted image file, a remote attacker could possibly use this issue to cause VLC to crash, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-19721)

It was discovered that VLC could be made to write out of bounds when processing H.264 video files. If a user were tricked into opening a crafted H.264 video file, a remote attacker could possibly use this issue to cause VLC to crash, leading to a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-13428)

It was discovered that VLC could be made to read out of bounds when processing AVI video files. If a user were tricked into opening a crafted AVI video file, a remote attacker could possibly use this issue to cause VLC to crash, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-25801, CVE-2021-25802, CVE-2021-25803, CVE-2021-25804)

It was discovered that the VNC module of VLC contained an arithmetic overflow. If a user were tricked into opening a crafted playlist or connecting to a rouge VNC server, a remote attacker could possibly use this issue to cause VLC to crash, leading to a denial of service, or possibly execute arbitrary code. (CVE-2022-41325)

Record
USN-6180-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
vlc
Debian:12
 before 3.0.12-1
3.0.12-1
vlc
Debian:13
 before 3.0.12-1
3.0.12-1
vlc
Debian:14
 before 3.0.12-1
3.0.12-1
vlc
Debian:9
 before 3.0.11-0+deb9u2, plus listed versions
2.2.6-12.2.6-1~deb9u12.2.6-22.2.6-32.2.6-4
Show 45 moreShow less
2.2.6-52.2.6-62.2.7-12.2.7-1~deb8u12.2.7-1~deb9u12.2.8-12.2.8-23.0.0-13.0.0~rc1-13.0.0~rc1~20171206-13.0.0~rc1~20171210-13.0.0~rc1~20171210-23.0.0~rc2-13.0.0~rc2-23.0.0~rc4-13.0.0~rc4-23.0.0~rc4-33.0.0~rc5-13.0.0~rc6-13.0.0~rc7-13.0.0~rc7-23.0.0~rc8-13.0.1-13.0.1-23.0.1-33.0.10-0+deb9u13.0.10-13.0.10-23.0.11-0+deb9u13.0.2-0+deb9u13.0.2-13.0.2-1+0.riscv64.13.0.2-1+0.riscv64.23.0.3-13.0.3-1+0.riscv64.13.0.3-1+b1+0.riscv64.13.0.3-1-0+deb9u13.0.3-1-13.0.3-1-23.0.3-1-33.0.3-1-43.0.3-23.0.4-13.0.4-23.0.4-3
3.0.11-0+deb9u2
vlc
Debian:10
 before 3.0.12-0+deb10u1, plus listed versions
3.0.10-0+deb10u13.0.10-13.0.10-23.0.11-0+deb10u13.0.11-1
Show 18 moreShow less
3.0.11-23.0.11-33.0.11-3~exp13.0.11-3~exp23.0.11-43.0.11.1-13.0.11.1-23.0.11.1-33.0.7-13.0.7.1-13.0.7.1-23.0.7.1-33.0.8-0+deb10u13.0.8-13.0.8-23.0.8-33.0.8-43.0.9.2-1
3.0.12-0+deb10u1
vlc
Ubuntu:Pro:16.04:LTS
 before 2.2.2-5ubuntu0.16.04.5+esm2, plus listed versions
2.2.1-32.2.1-52.2.2-12.2.2-22.2.2-3
Show 8 moreShow less
2.2.2-3build12.2.2-42.2.2-52.2.2-5ubuntu0.16.04.12.2.2-5ubuntu0.16.04.22.2.2-5ubuntu0.16.04.32.2.2-5ubuntu0.16.04.42.2.2-5ubuntu0.16.04.5+esm1
2.2.2-5ubuntu0.16.04.5+esm2
vlc
Ubuntu:Pro:18.04:LTS
 before 3.0.8-0ubuntu18.04.1+esm1, plus listed versions
2.2.6-62.2.6-6build12.2.7-12.2.8-12.2.8-1ubuntu4
Show 20 moreShow less
2.2.8-23.0.0~rc1-1ubuntu13.0.0~rc1-1ubuntu33.0.0~rc2-1ubuntu13.0.0~rc2-2ubuntu13.0.0~rc2-2ubuntu23.0.0~rc4-1ubuntu13.0.0~rc7-2ubuntu13.0.0~rc8-1ubuntu13.0.0-1ubuntu13.0.1-1ubuntu53.0.1-2ubuntu13.0.1-2ubuntu23.0.1-33.0.1-3build13.0.2-0ubuntu0.13.0.3-1-1ubuntu13.0.4-1ubuntu0.23.0.7.1-0ubuntu18.04.13.0.8-0ubuntu18.04.1
3.0.8-0ubuntu18.04.1+esm1
vlc
Ubuntu:Pro:20.04:LTS
 before 3.0.9.2-1ubuntu0.1~esm1, plus listed versions
3.0.8-23.0.8-2build13.0.8-33.0.8-3build13.0.8-3build23.0.8-3build43.0.8-43.0.9.2-1
3.0.9.2-1ubuntu0.1~esm1
vlc
Ubuntu:Pro:22.04:LTS
 before 3.0.16-1ubuntu0.1~esm1, plus listed versions
3.0.16-13.0.16-1build13.0.16-1build23.0.16-1build33.0.16-1build43.0.16-1build53.0.16-1build7
3.0.16-1ubuntu0.1~esm1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubDShankle/VLC_CVE-2021-25804_Analysis2022-05-23

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-25804 is a high vulnerability (CVSS 7.5) in Videolan Vlc Media Player, published January 22, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.81%, the 78th percentile. Fixed in vlc 3.0.12-1.

References

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Left out here: 16 versions. The JSON record has them.

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