CVE-2009-2953

Exp

Mozilla Firefox 3.0.6 through 3.0.13, and 3.5.x, allows remote attackers to cause a denial of service (CPU consumption) via JavaScript code with a long string value for the hash property (aka location.hash), a related issue to CVE-2008-5715.

Published: 2009-08-24 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-2953 is rated High Exploit Risk (68.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.62%, 90th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.03% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2009-2953

EDB-ID Source Kind Published Link
7554 exploit_db edb 2008-12-23 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2009-2953

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.60% 4.62% +2.03%
2 2025-03-30 3.58% 2.60% -0.98%
3 2025-03-29 — 3.58% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-2953

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-2953

OS Trackers for CVE-2009-2953

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2009-2953
ubuntu negligible CVE-2009-2953 negligible priority: Ubuntu including 3 source packages (firefox, xulrunner-1.9, xulrunner-1.9.1), 18 status rows across 6 suites (dapper, hardy, intrepid, jaunty, karmic, upstream): DNE 8, ignored 7, not-affected 2, needs-triage 1. https://ubuntu.com/security/CVE-2009-2953

Affected software / configurations for CVE-2009-2953

Vendor Product Version Raw CPE
mozilla firefox 3.0.6 cpe:2.3:a:mozilla:firefox:3.0.6:*:*:*:*:*:*:*
mozilla firefox 3.0.7 cpe:2.3:a:mozilla:firefox:3.0.7:*:*:*:*:*:*:*
mozilla firefox 3.0.8 cpe:2.3:a:mozilla:firefox:3.0.8:*:*:*:*:*:*:*
mozilla firefox 3.0.9 cpe:2.3:a:mozilla:firefox:3.0.9:*:*:*:*:*:*:*
mozilla firefox 3.0.10 cpe:2.3:a:mozilla:firefox:3.0.10:*:*:*:*:*:*:*
mozilla firefox 3.0.11 cpe:2.3:a:mozilla:firefox:3.0.11:*:*:*:*:*:*:*
mozilla firefox 3.0.12 cpe:2.3:a:mozilla:firefox:3.0.12:*:*:*:*:*:*:*
mozilla firefox 3.0.13 cpe:2.3:a:mozilla:firefox:3.0.13:*:*:*:*:*:*:*
mozilla firefox 3.5 cpe:2.3:a:mozilla:firefox:3.5:*:*:*:*:*:*:*
mozilla firefox 3.5.1 cpe:2.3:a:mozilla:firefox:3.5.1:*:*:*:*:*:*:*
mozilla firefox 3.5.2 cpe:2.3:a:mozilla:firefox:3.5.2:*:*:*:*:*:*:*
mozilla firefox 3.5.3 cpe:2.3:a:mozilla:firefox:3.5.3:*:*:*:*:*:*:*
mozilla firefox 3.5.4 cpe:2.3:a:mozilla:firefox:3.5.4:*:*:*:*:*:*:*

References for CVE-2009-2953

cvelogic Threat Intelligence