CVE-2024-11695: Mozilla Firefox · URL Bar Spoofing via Manipulated Punycode and Whitespace Characters
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 5.4 Medium : upgrade to 133 or 128.5 when convenient.
Data as of 26 Oct 2026, 06:26 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 133, 128.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Nov 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Upgrade Mozilla Firefox to 133 or 128.5.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
1. 2. Implement enterprise-wide browser update policies to ensure timely deployment of security patches. 3. Educate users about the risks of clicking suspicious links, especially those with unusual characters or scripts in URLs, emphasizing vigilance with emails and messages containing Arabic script or whitespace anomalies. 4. Deploy email filtering and web gateway solutions capable of detecting and blocking URLs with suspicious punycode or Unicode manipulations. 5. Utilize browser security features such as enhanced phishing protection and URL highlighting to help users identify potentially spoofed URLs. 6. Conduct phishing simulation exercises tailored to this vulnerability to raise awareness. 7. For critical systems, consider restricting browser usage to updated versions or alternative browsers until patches are confirmed. 8. Monitor network traffic for unusual URL patterns indicative of exploitation attempts. 9. Collaborate with incident response teams to prepare for potential phishing campaigns exploiting this vulnerability.
Description
A crafted URL containing Arabic script and whitespace characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1925496 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-63/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-64/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-67/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-68/ (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/11/msg00029.html (opens in a new tab)