7.5

CVE-2022-34477: mozilla firefox Observable Discrepancy

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2022-34477
Published 22-12-2022Last modified 15-04-2025
Open JSON

Vulnerability summary

CVE-2022-34477 is a high (CVSS 7.5) Observable Discrepancy vulnerability in mozilla firefox. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.56%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 6
OPENSUSE-SU-2024:12184-1OPENSUSE-SU-2024:14572-1SUSE-SU-2022:3272-1SUSE-SU-2022:3273-1SUSE-SU-2022:3396-1USN-5504-1

Timeline

  1. 22-12-2022
    PublishedVulnerability first disclosed.
  2. 15-04-2025
    Last modifiedVulnerability information updated.

Description

The MediaError message property should be consistent to avoid leaking information about cross-origin resources; however for a same-site cross-origin resource, the message could have leaked information enabling XS-Leaks attacks. This vulnerability affects Firefox < 102.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.56%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.01 pp

From 0.55% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.56%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mozilla1 product
  • firefox≥ unspecified, < 102 | < 102.0
Ubuntu1 product
  • firefox< 102.0+build2-0ubuntu0.18.04.1 | < 102.0+build2-0ubuntu0.20.04.1

2 vendors · 2 products

References

6 links