CVE-2013-0238

Exp

The try_parse_v4_netmask function in hostmask.c in IRCD-Hybrid before 8.0.6 does not properly validate masks, which allows remote attackers to cause a denial of service (crash) via a mask that causes a negative number to be parsed.

Published: 2013-02-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-0238 is rated High Exploit Risk (63.2/100): CVSS Medium severity, with high exploitation likelihood (EPSS 9.96%, 95th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2013-0238

EDB-ID Source Kind Published Link
24951 exploit_db edb 2013-04-12 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2013-0238

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 39.23% 9.96% -29.26%
2 2025-03-30 42.58% 39.23% -3.35%
3 2025-03-29 — 42.58% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-0238

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-2013-0238

OS Trackers for CVE-2013-0238

vendor priority summary link
debian high CVE-2013-0238 high priority: Debian including 1 source packages (ircd-hybrid), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): resolved 4. https://security-tracker.debian.org/tracker/CVE-2013-0238
ubuntu medium CVE-2013-0238 medium priority: Ubuntu including 2 source packages (ircd-hybrid, oftc-hybrid), 30 status rows across 15 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 11, DNE 9, not-affected 8, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2013-0238

Affected software / configurations for CVE-2013-0238

Vendor Product Version Raw CPE
ircd-hybrid ircd-hybrid <= 8.0.5 cpe:2.3:a:ircd-hybrid:ircd-hybrid:*:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.2.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.0:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.2.1 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.1:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.2.2 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.2:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.2.3 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.3:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.3.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.0:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.3.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.0:rc1:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 7.3.1 cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.1:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta1:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta2:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta3:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.0 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:rc1:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.1 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.1:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.2 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.2:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.3 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.3:*:*:*:*:*:*:*
ircd-hybrid ircd-hybrid 8.0.4 cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.4:*:*:*:*:*:*:*

References for CVE-2013-0238

cvelogic Threat Intelligence