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CVE-2012-4435

17
FAUCET Score

CVE-2012-4435 describes a denial-of-service vulnerability in fwknop versions prior to 2.0.3. The flaw allows remote authenticated users to crash the server by submitting an improperly validated, excessively long IP address. With a CVSS score of 4.0, this vulnerability is of medium severity, requiring authentication and having a low attack complexity, but only impacting availability. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.0.2CPE matchmatch criteria
cpe:2.3:a:cipherdyne:fwknop:*:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:cipherdyne:fwknop:2.0:*:*:*:*:*:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:cipherdyne:fwknop:2.0.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Exploitability Score
8.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.33%
Probability of exploitation in next 30 days
EPSS Percentile
81.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0233 is in the 93rd percentile among its peer group of 21,951 CVEs.

Social Chatter

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

Remediation records are not available for this CVE.

References

exchange.xforce.ibmcloud.com / vulnerabilities/79568
cipherdyne.org / blog/2012/09/software-release-fwknop-2.0.3.html
Vendor Advisory
cipherdyne.org / cgi-bin/gitweb.cgi
cipherdyne.org / cgi-bin/gitweb.cgi
openwall.com / lists/oss-security/2012/09/19/2
openwall.com / lists/oss-security/2012/09/20/2
openwall.com / lists/oss-security/2012/09/20/4