CVE-2022-45406: mozilla firefox Use After Free

Modified

AliasesUBUNTU-CVE-2022-45406DEBIAN-CVE-2022-45406ALPINE-CVE-2022-45406

Published 22-12-2022Last modified 15-04-2025

Vulnerability summary

CVE-2022-45406 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.07% chance of exploitation in the next 30 days, higher than 64.9% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

9.8/10

010

Critical · v3.1 (CVE.org)

EPSS score

1.07%

0%100%

Low · +0.02 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

22-12-2022
PublishedVulnerability first disclosed.
15-04-2025
Last modifiedVulnerability information updated.

Description

If an out-of-memory condition occurred when creating a JavaScript global, a JavaScript realm may be deleted while references to it lived on in a BaseShape. This could lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107.

CVSS metrics

5 scores · 5 sources · 1 version

v3.19.8

EPSS trend

Probability

1.07%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 1.05% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu6 products

mozjs38All versions (No fix recorded)
mozjs52All versions (No fix recorded)
mozjs68All versions (No fix recorded)
mozjs78All versions (No fix recorded)
mozjs91All versions (No fix recorded)

Show all 6

Mozilla3 products

firefox≥ unspecified, < 107 | < 107.0
firefox esr≥ unspecified, < 102.5 | < 102.5
thunderbird≥ unspecified, < 102.5 | < 102.5

Debian2 products

firefox-esr< 102.5.0esr-1
thunderbird< 1:102.5.0-1

Alpine1 product

firefox-esr< 102.5.0-r0

4 vendors · 12 products

References

13 links

www.mozilla.org/security/advisories/mfsa2022-47/Vendor Advisory
www.mozilla.org/security/advisories/mfsa2022-49/Vendor Advisory
www.mozilla.org/security/advisories/mfsa2022-48/Vendor Advisory
bugzilla.mozilla.org/show_bug.cgi?id=1791975Issue TrackingPermissions RequiredVendor Advisory
ubuntu.com/security/CVE-2022-45406REPORT
www.mozilla.org/en-US/security/advisories/mfsa2022-47/REPORT
www.mozilla.org/en-US/security/advisories/mfsa2022-48/REPORT
www.mozilla.org/en-US/security/advisories/mfsa2022-49/REPORT
ubuntu.com/security/notices/USN-5726-1Advisory
ubuntu.com/security/notices/USN-5824-1Advisory

Show all 13 references

www.cve.org/CVERecord?id=CVE-2022-45406REPORT
security-tracker.debian.org/tracker/CVE-2022-45406Advisory
security.alpinelinux.org/vuln/CVE-2022-45406Advisory