CVE-2012-4435

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.

Published: 2012-10-22 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4435 is rated Moderate Risk (43.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.24%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2012-4435

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 2026-03-02 1.25% 1.24% -0.01%
2 2025-03-17 14.56% 1.25% -13.31%
3 2024-12-17 — 14.56% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4435

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/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:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2012-4435

OS Trackers for CVE-2012-4435

vendor priority summary link
debian not yet assigned CVE-2012-4435 not yet assigned priority: Debian including 1 source packages (fwknop), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2012-4435
ubuntu medium CVE-2012-4435 medium priority: Ubuntu including 1 source packages (fwknop), 16 status rows across 16 suites (hardy, lucid, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): not-affected 8, ignored 4, DNE 2, released 2. https://ubuntu.com/security/CVE-2012-4435

Affected software / configurations for CVE-2012-4435

Vendor Product Version Raw CPE
cipherdyne fwknop <= 2.0.2 cpe:2.3:a:cipherdyne:fwknop:*:*:*:*:*:*:*:*
cipherdyne fwknop 2.0 cpe:2.3:a:cipherdyne:fwknop:2.0:*:*:*:*:*:*:*
cipherdyne fwknop 2.0.1 cpe:2.3:a:cipherdyne:fwknop:2.0.1:*:*:*:*:*:*:*

References for CVE-2012-4435

cvelogic Threat Intelligence