4.3

CVE-2019-11743: mozilla firefox Observable Discrepancy

CVSS: 4.3v2.0MediumModified
AliasesUBUNTU-CVE-2019-11743DEBIAN-CVE-2019-11743
Published 27-09-2019Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2019-11743 is a medium (CVSS 4.3) Observable Discrepancy vulnerability in mozilla firefox. EPSS estimates a 1.80% chance of exploitation in the next 30 days, higher than 78.1% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v2.0 (NVD)
EPSS score
1.80%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 29 · Related 15
DLA-1910-1DLA-1926-1DSA-4516-1DSA-4523-1MGASA-2019-0267MGASA-2019-0268

Timeline

  1. 27-09-2019
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.80%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

0.00 pp

From 1.80% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.80%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (w3c.github.io)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Ubuntu4 products
  • firefox< 69.0+build2-0ubuntu0.16.04.4 | < 69.0+build2-0ubuntu0.18.04.1
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • thunderbird< 1:60.9.0+build1-0ubuntu0.16.04.2 | < 1:60.9.0+build1-0ubuntu0.18.04.1
Mozilla3 products
  • firefox≥ unspecified, < 69 | < 60.9.0 | < 69.0
  • firefox_esr≥ unspecified, < 60.9 | ≥ unspecified, < 68.1 | ≥ 68.0, < 68.1.0
  • thunderbird≥ unspecified, < 68.1 | ≥ unspecified, < 60.9 | < 60.9.0 | ≥ 68.0, < 68.1.0
Debian2 products
  • firefox-esr< 68.1.0esr-1
  • thunderbird< 1:60.9.0-1

3 vendors · 9 products

References

20 links
Show all 20 references