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🛡️ CVE-2021-30836 on Ubuntu — qtwebkit-opensource-src

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 14.8 and iPadOS 14.8, tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted audio file may disclose restricted memory.

Distribution advisory

This page covers CVE-2021-30836 as tracked by Ubuntu, for the package qtwebkit-opensource-src. The fix is available in version 2.32.4-0ubuntu0.20.04.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Affected software

UBUNTU-CVE-2021-30836 is recorded against 5 packages.

  • qtwebkit-opensource-src
  • qtwebkit-source
  • webkit2gtk (fixed in 2.32.4-0ubuntu0.20.04.1)
  • webkitgtk
  • wpewebkit

Timeline and source

Published on 28 October 2021 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
webkitgtk.org (Report)
www.cve.org (Report)

Other advisories for this package

qtwebkit-opensource-src has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2021-30836 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2021-10-28
Updated 2026-08-20
Modified 2026-04-22
Fix URL N/A

Affected Packages

Software From version Fixed in
qtwebkit-opensource-src — —
qtwebkit-source — —
webkit2gtk — 2.32.4-0ubuntu0.20.04.1
webkitgtk — —
wpewebkit — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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