CVE-2012-4435 json
fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server c…
published 2012-10-22 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4369
- cvss
- 4.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.3%
- EPSS 2.3% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
fwknop before 2.0.3 does not properly validate IP addresses, which allows remote authenticated users to cause a denial of service (server crash) via a long IP address.
Patch / fix
- fwknop Debian 14, Debian 13, Debian 12 2.0.3-1
debian advisories DEBIAN-CVE-2012-4435
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2012-4435 updated cvss 4.0
fwknop: fwknopd server did not properly validate allowed IP addresses from malicious authenticated clients
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.33% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
cipherdyne.org
/blog/2012/09/software-release-fwknop-2.0.3.html
vendor-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/79568
vdb-entry
-
openwall.com
/lists/oss-security/2012/09/19/2
mailing-list
-
openwall.com
/lists/oss-security/2012/09/20/4
mailing-list
- cipherdyne.org /cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=263fa01f2af1d336961df320f1c7a9ea84ddac9a
- cipherdyne.org /cgi-bin/gitweb.cgi?p=fwknop.git%3Ba=commitdiff%3Bh=f4c16bc47fc24a96b63105556b62d61c1ba7d799
-
openwall.com
/lists/oss-security/2012/09/20/2
mailing-list
Sources
- CVE List CVE-2012-4435
- NVD CVE-2012-4435
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.