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CVE-2009-2535

28
FAUCET Score

CVE-2009-2535 is a denial-of-service vulnerability affecting Mozilla Firefox versions prior to 2.0.0.19 and 3.0.5, SeaMonkey, and Thunderbird. It allows remote attackers to crash the application and consume memory by providing a large integer value for the length property of a Select object. This vulnerability has a CVSS score of 5.0, indicating a medium severity, and is easily exploitable over the network with no authentication required, leading to a partial availability impact. While not listed in CISA's KEV catalog, an ExploitDB entry exists (EDB-9160), though there is no evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.0.18CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.1:*:*:*:*:*:*:*
0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.2:*:*:*:*:*:*:*
0.4CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.4:*:*:*:*:*:*:*
0.6CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:0.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
9.29%
Probability of exploitation in next 30 days
EPSS Percentile
94.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-9160 · Jul 15, 2009
This CVE's current EPSS score of 0.0929 is in the 94th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-2535Low

Thunderbird: DoS via large length property of a Select object

Jul 15, 2009

References

bugzilla.mozilla.org / show_bug.cgi
exploit-db.com / exploits/9160
g-sec.lu / one-bug-to-rule-them-all.html
securityfocus.com / archive/1/504969/100/0/threaded
securityfocus.com / archive/1/504988/100/0/threaded
securityfocus.com / archive/1/504989/100/0/threaded
securityfocus.com / archive/1/505006/100/0/threaded