CVE-2013-1241

CVE-2013-1241 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.3)
• EPSS exploit prediction: 1% (70th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-287
• Affected product: Cisco Ios
• Published: 2013-05-08
• Last modified: 2026-06-16

Description

The ISM module in Cisco IOS on ISR G2 routers does not properly handle authentication-header packets, which allows remote authenticated users to cause a denial of service (module reload) via a series of malformed packets, aka Bug ID CSCub92025.

Frequently asked questions

What is CVE-2013-1241?

The ISM module in Cisco IOS on ISR G2 routers does not properly handle authentication-header packets, which allows remote authenticated users to cause a denial of service (module reload) via a series of malformed packets, aka Bug ID CSCub92025.

How severe is CVE-2013-1241?

CVE-2013-1241 has a CVSS 2.0 base score of 6.3, rated medium severity.

Is CVE-2013-1241 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1241?

CVE-2013-1241 primarily affects Cisco Ios. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-1241?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-1241 published?

CVE-2013-1241 was published on 2013-05-08 and last updated on 2026-06-16.

References

• http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1241

Affected products (27)

• cpe:2.3:o:cisco:ios:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:1921_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:1941_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:1941w_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:2901_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:2911_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:2921_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:2951_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:3925_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:3925e_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:3945_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:3945e_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:861_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:867_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:880_3g_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:881_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:886_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:886va-w_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:886va_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:887_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:887v_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:887va-w_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:887va_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:888_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:891_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:892_integrated_services_router:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:c881w_integrated_services_router:-:*:*:*:*:*:*:*

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