4.3

CVE-2009-5017: mozilla firefox

Modified
Published 12-11-2010Last modified 16-09-2024

Vulnerability summary

CVE-2009-5017 is a medium (CVSS 4.3) vulnerability in mozilla firefox. EPSS estimates a 1.83% chance of exploitation in the next 30 days, higher than 78.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v2.0 (NVD)
EPSS score
1.83%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 2
RHSA-2010:0500RHSA-2010:0501

Timeline

  1. 12-11-2010
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

Mozilla Firefox before 3.6 Beta 3 does not properly handle overlong UTF-8 encoding, which makes it easier for remote attackers to bypass cross-site scripting (XSS) protection mechanisms via a crafted string, a different vulnerability than CVE-2010-1210.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

1.83%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.83% 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

1 found
  • referenceUnverified

    Exploit Reference (sirdarckcat.blogspot.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

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

Mozilla1 product

1 vendor · 1 product

References

4 links