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VulnerabilityPublished Updated

CVE-2023-4584: Mozilla Firefox

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · fixed in 117 : patch Mozilla Firefox soon.

Data as of 26 Oct 2026, 09:15 UTC

Severity
High

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

  1. Disclosed: evidence found.

    CVE published 11 Sep 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <117
  • <102.15
  • <115.2
Fixed in
  • 117
  • 102.15
  • 115.2

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

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