CVE-2023-4575: Mozilla Firefox
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · fixed in 117 : patch Mozilla Firefox soon.
Data as of 26 Oct 2026, 08:30 UTC
Rated High by the CNA (mozilla) · No CVSS score from NVD or the CNA
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 117, 115.2, 102.15
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 2023
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 26 Oct 2026.
What to do
Upgrade Mozilla Firefox to 117, 115.2 or 102.15.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 117, Firefox ESR 102.15 and 115.2, and Thunderbird 102.15 and 115.2. Users and administrators should update affected products to these versions or later to remediate the issue. No additional mitigation steps are required beyond applying these updates.
Description
CVE-2023-4575 is a high-impact memory corruption vulnerability in Mozilla Firefox and Thunderbird involving IPC callbacks for the File Picker window. Multiple identical callbacks could be created and then simultaneously destroyed when one finished, leading to a use-after-free condition and a potentially exploitable crash. This flaw affects Firefox versions prior to 117, Firefox ESR versions prior to 102.15 and 115.2, as well as Thunderbird versions prior to 102.15 and 115.2. Mozilla has released official fixes in Firefox 117, Firefox ESR 102.15 and 115.2, and Thunderbird 102.15 and 115.2. No known exploits in the wild have been reported.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1846689 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-34/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-35/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-36/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-37/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2023-38/ (opens in a new tab)