CVE-2019-9790: mozilla firefox Use After Free

Modified

AliasesUBUNTU-CVE-2019-9790DEBIAN-CVE-2019-9790ALPINE-CVE-2019-9790

Published 26-04-2019Last modified 04-08-2024

Vulnerability summary

CVE-2019-9790 is a critical (CVSS 9.8) Use After Free vulnerability in mozilla firefox. EPSS estimates a 1.85% chance of exploitation in the next 30 days, higher than 79.1% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

9.8/10

010

Critical · v3.0 (NVD)

EPSS score

1.85%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

26-04-2019
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

A use-after-free vulnerability can occur when a raw pointer to a DOM element on a page is obtained using JavaScript and the element is then removed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CVSS metrics

5 scores · 4 sources · 2 versions

v3.09.8v2.07.5

EPSS trend

Probability

1.85%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.85% 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Ubuntu4 products

firefox< 66.0.1+build1-0ubuntu0.14.04.1 | < 66.0+build3-0ubuntu0.16.04.2 | < 66.0+build3-0ubuntu0.18.04.1
mozjs38All versions (No fix recorded)
mozjs52All versions (No fix recorded)
thunderbird< 1:60.6.1+build2-0ubuntu0.14.04.1 | < 1:60.6.1+build2-0ubuntu0.16.04.1 | < 1:60.6.1+build2-0ubuntu0.18.04.1

Mozilla3 products

firefox≥ unspecified, < 66 | ≤ 60.6 | ≤ 66.0
firefox esr≥ unspecified, < 60.6
thunderbird≥ unspecified, < 60.6 | ≤ 60.6

Debian2 products

firefox-esr< 60.6.0esr-1
thunderbird< 1:60.6.1-1

Alpine1 product

firefox-esr< 60.6.1-r0

4 vendors · 10 products

References

16 links

www.mozilla.org/security/advisories/mfsa2019-07/X Refsource MISCVendor Advisory
www.mozilla.org/security/advisories/mfsa2019-08/X Refsource MISCVendor Advisory
www.mozilla.org/security/advisories/mfsa2019-11/X Refsource MISCVendor Advisory
bugzilla.mozilla.org/show_bug.cgi?id=1525145X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
access.redhat.com/errata/RHSA-2019:0966Vendor AdvisoryX Refsource REDHAT
access.redhat.com/errata/RHSA-2019:1144Vendor AdvisoryX Refsource REDHAT
ubuntu.com/security/CVE-2019-9790REPORT
www.mozilla.org/en-US/security/advisories/mfsa2019-08/REPORT
www.mozilla.org/en-US/security/advisories/mfsa2019-07/REPORT
www.mozilla.org/en-US/security/advisories/mfsa2019-11/REPORT

Show all 16 references

ubuntu.com/security/notices/USN-3918-1Advisory
ubuntu.com/security/notices/USN-3918-2Advisory
ubuntu.com/security/notices/USN-3927-1Advisory
www.cve.org/CVERecord?id=CVE-2019-9790REPORT
security-tracker.debian.org/tracker/CVE-2019-9790Advisory
security.alpinelinux.org/vuln/CVE-2019-9790Advisory