CVE-2013-0238

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 10.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Elevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS v2: 5.0Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity50% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
10%
EPSS %ILE
95%
KEV
Not listed

Published

February 13, 2013

Last Modified

April 29, 2026

References (24)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
ircd-hybrid—1:7.2.2.dfsg.2-10—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ircd-hybrid—1:7.2.2.dfsg.2-10—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ircd-hybrid—1:7.2.2.dfsg.2-10—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
ircd-hybrid1:7.2.2.dfsg.2-6.21:7.2.2.dfsg.2-6.2+squeeze1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 19× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-20 22:50 UTCEPSS rescore
  3. 2026-08-19 16:59 UTCEPSS rescore
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  9. 2026-08-07 21:26 UTCOSV refresh
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  15. 2026-07-30 01:26 UTCEPSS rescore
  16. 2026-07-28 15:31 UTCEPSS rescore
  17. 2026-07-26 13:47 UTCEG score recompute▲ 5.00
  18. 2026-07-25 14:12 UTCEPSS rescore
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  20. 2026-07-23 01:09 UTCEG score recompute
  21. 2026-07-23 00:12 UTCEG score recompute
  22. 2026-07-22 21:51 UTCEG score recompute
  23. 2026-07-22 14:31 UTCOSV refresh
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-21 15:21 UTCEPSS rescore
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  17. 2026-07-06 02:19 UTCEPSS rescore
  18. 2026-07-06 02:19 UTCEPSS rescore
  19. 2026-07-05 09:59 UTCOSV refresh
  20. 2026-07-05 02:26 UTCEPSS rescore
  21. 2026-07-04 06:27 UTCEPSS rescore
  22. 2026-07-01 15:02 UTCEPSS rescore
  23. 2026-06-30 23:19 UTCEPSS rescore
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  25. 2026-06-28 04:53 UTCEPSS rescore
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  27. 2026-06-27 03:05 UTCEPSS rescore
  28. 2026-06-25 13:46 UTCEPSS rescore
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  31. 2026-06-23 21:30 UTCEPSS rescore
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  37. 2026-06-18 17:49 UTCEPSS rescore
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  40. 2026-06-17 17:49 UTCEPSS rescore
  41. 2026-06-16 21:05 UTCOSV refresh
  42. 2026-06-16 17:49 UTCEPSS rescore
  43. 2026-06-16 17:49 UTCEPSS rescore
  44. 2026-06-15 17:44 UTCEPSS rescore
  45. 2026-06-13 22:57 UTCEPSS rescore
  46. 2026-06-12 23:08 UTCEPSS rescore
  47. 2026-06-11 13:56 UTCEPSS rescore
  48. 2026-06-10 13:18 UTCEPSS rescore
  49. 2026-06-08 14:14 UTCEPSS rescore
  50. 2026-06-06 13:45 UTCEPSS rescore
  51. 2026-06-06 13:45 UTCEPSS rescore
  52. 2026-06-05 22:44 UTCEPSS rescore
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  54. 2026-06-05 06:08 UTCEPSS rescore
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  56. 2026-06-02 20:10 UTCEPSS rescore
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  58. 2026-05-31 22:28 UTCEPSS rescore
  59. 2026-05-31 22:28 UTCEPSS rescore
  60. 2026-05-31 00:14 UTCEPSS rescore
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  62. 2026-05-29 13:41 UTCEPSS rescore
  63. 2026-05-29 13:41 UTCEPSS rescore
  64. 2026-05-29 00:59 UTCEG score recompute
  65. 2026-05-29 00:59 UTCGHSA enrichment
  66. 2026-05-28 13:42 UTCEPSS rescore
  67. 2026-05-28 13:42 UTCEPSS rescore
  68. 2026-05-28 13:42 UTCEPSS rescore
  69. 2026-05-27 13:38 UTCEPSS rescore
  70. 2026-05-27 13:38 UTCEPSS rescore
  71. 2026-05-26 13:41 UTCEPSS rescore
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  73. 2026-05-26 07:16 UTCEPSS rescore
  74. 2026-05-26 07:16 UTCEPSS rescore
  75. 2026-05-22 21:15 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-24951
    First seen Apr 12, 2013

    ircd-hybrid 8.0.5 - Denial of Service

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2013-0238?
CVE-2013-0238 is a medium vulnerability published on February 13, 2013. The tryparsev4_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.
When was CVE-2013-0238 disclosed?
CVE-2013-0238 was first published in the National Vulnerability Database on February 13, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-0238 actively exploited?
CVE-2013-0238 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.8% of all scored CVEs.
How do I remediate CVE-2013-0238?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-0238, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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