9.8

CVE-2019-9791: mozilla firefox

Modified
AliasesUBUNTU-CVE-2019-9791DEBIAN-CVE-2019-9791ALPINE-CVE-2019-9791
Published 26-04-2019Last modified 04-08-2024

Vulnerability summary

CVE-2019-9791 is a critical (CVSS 9.8) vulnerability in mozilla firefox. EPSS estimates a 19.91% chance of exploitation in the next 30 days, higher than 97.4% of scored vulnerabilities. 2 public exploits are recorded.

Priority
Prioritisepublic exploit

Public exploit (exploit-database, 26-03-2019)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
19.91%
0%100%
Medium · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits2reference, 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 type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an 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

19.91%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

No change 0.00 pp

From 19.91% 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

2 found
  • referenceUnverified

    Exploit Reference (bugzilla.mozilla.org)

    Maturity: unknown

  • exploit-databasedosmultipleVerified

    Spidermonkey - IonMonkey Type Inference is Incorrect for Constructors Entered via OSR

    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

16 links
Show all 16 references