CVE-2009-5038 — Cisco IOS before 15.0(1)XA does not properly handle IRC traffic during a specific time period after an initial reload, which allows remote attackers to cause a denial of service (device reload) via an attempted connection to a certain IRC server, related to a "corrupted magic value," aka Bug ID CSCso05336

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HIGH

Cisco IOS before 15.0(1)XA does not properly handle IRC traffic during a specific time period after an initial reload, which allows remote attackers to cause a denial of service (device reload) via an attempted connection to a certain IRC server, related to a "corrupted magic value," aka Bug ID CSCso05336

Published Jan 7, 2011

7.8

HIGH

CVSS 2.0

EPSS 3.18%

Description

Cisco IOS before 15.0(1)XA does not properly handle IRC traffic during a specific time period after an initial reload, which allows remote attackers to cause a denial of service (device reload) via an attempted connection to a certain IRC server, related to a "corrupted magic value," aka Bug ID CSCso05336.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.18% 0.03179

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.03179

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	3.18% (0.03179)	87.62th	v5 (v2026.06.15)
Jun 15, 2026	3.18% (0.03179)	86.35th	v5 (v2026.06.15)
Mar 17, 2025	0.85% (0.00851)	73.30th	v4 (v2025.03.14)
Dec 12, 2024	0.26% (0.00259)	66.15th	v3 (v2023.03.01)
Feb 8, 2024	0.26% (0.00259)	64.68th	v3 (v2023.03.01)
Mar 7, 2023	0.26% (0.00259)	61.87th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Oct 18, 2022	1.14% (0.01136)	58.28th	v2 (v2022.01.01)
Apr 1, 2022	1.14% (0.01136)	56.27th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (3)

http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf
x_refsource_CONFIRMRelease NotesVendor Advisory
http://www.securityfocus.com/bid/45764
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/64682
vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf		x_refsource_CONFIRMRelease NotesVendor Advisory
http://www.securityfocus.com/bid/45764		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/64682		vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Jan 7, 2011

Updated Aug 7, 2024

Reserved Jan 7, 2011

Link CVE-2009-5038

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2009-5038

Red Hat

Severity n/a

Public date n/a

Links CVE-2009-5038