9.8

CVE-2019-9792: mozilla firefox Out-of-bounds Write

Modified
AliasesUBUNTU-CVE-2019-9792DEBIAN-CVE-2019-9792ALPINE-CVE-2019-9792
Published 26-04-2019Last modified 04-08-2024

Vulnerability summary

CVE-2019-9792 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in mozilla firefox. EPSS estimates a 13.30% chance of exploitation in the next 30 days, higher than 96.3% of scored vulnerabilities. 3 public exploits are recorded.

Priority
Prioritisepublic exploit

Public exploit (exploit-database, 29-05-2019)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
13.30%
0%100%
Medium · +0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits3reference, exploit-database

Advisory lineage

Upstream 0 · Downstream 23 · Related 11
DLA-1722-1DLA-1743-1DSA-4411-1DSA-4420-1MGASA-2019-0116MGASA-2019-0129

Timeline

  1. 26-04-2019
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CVSS metrics

6 scores · 4 sources · 3 versions

EPSS trend

Probability

13.30%

Chance of exploitation in the next 30 days

Percentile

96%

Versus all other CVEs

30-day change

Increase +0.11 pp

From 13.20% 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

3 found
  • referenceUnverified

    Exploit Reference (bugzilla.mozilla.org)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (packetstormsecurity.com)

    Maturity: unknown

  • exploit-databasedosmultipleVerified

    Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

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

Redhat4 products
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
Debian2 products
  • firefox-esr< 60.6.0esr-1
  • thunderbird< 1:60.6.1-1
Alpine1 product
  • firefox-esr< 60.6.1-r0

5 vendors · 14 products

References

17 links
Show all 17 references