Distribution advisory
This page covers CVE-2023-6211 as tracked by Ubuntu, for the package firefox. The fix is available in version 120.0+build2-0ubuntu0.20.04.1; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, 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 none, integrity high, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- Attack vector: Network — reachable from anywhere that can route to the service.
- 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: None.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: None.
Weakness class
UBUNTU-CVE-2023-6211 is classified as CWE-1021: Improper Restriction of Rendered UI Layers. The interface can be framed or overlaid by another site, so clicks can be redirected without the user noticing.
Affected software
UBUNTU-CVE-2023-6211 is recorded against 7 packages.
- firefox (fixed in 120.0+build2-0ubuntu0.20.04.1)
- mozjs102
- mozjs38
- mozjs52
- mozjs68
- mozjs78
- mozjs91
Timeline and source
Published on 21 November 2023 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.mozilla.org (Report)
bugzilla.mozilla.org (Report)
www.mozilla.org (Report)
ubuntu.com (Advisory)
www.cve.org (Report)
Other advisories for this package
firefox has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-1021: Improper Restriction of Rendered UI Layers) in other software:
