CVE-2023-4584: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · fixed in 117 : patch Mozilla Firefox soon.
Data as of 26 Oct 2026, 07:57 UTC
Rated High by the CNA (mozilla) · No CVSS score from NVD or the CNA
- EPSS
- 0.8% chance of exploitation in 30 days – higher than 56% 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 2026-10-26.
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 these vulnerabilities in Firefox 117, Firefox ESR 102.15, Firefox ESR 115.2, Thunderbird 102.15, and Thunderbird 115.2. Users and administrators should update to these versions or later to mitigate the risk. No additional mitigation steps are required beyond applying these updates.
Description
CVE-2023-4584 addresses multiple memory safety bugs in Mozilla Firefox and Thunderbird versions prior to Firefox 117, Firefox ESR 102.15, Firefox ESR 115.2, Thunderbird 102.15, and Thunderbird 115.2. These bugs include memory corruption issues that could potentially be exploited to execute arbitrary code. The vulnerabilities affect Firefox 116, Firefox ESR 102.14, Firefox ESR 115.1, Thunderbird 102.14, and Thunderbird 115.1. Mozilla has released fixes in the specified updated versions.
References
- bugzilla.mozilla.org/buglist.cgi?bug_id=1843968%2C1845205%2C1846080%2C1846526%2C1847529 (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)