TI-2011-04010 Aliases CVE-2011-4661 GHSA-97hh-xg4h-8gvc

A memory leak vulnerability exists in Cisco IOS before 15.2(1)T due to a memory leak in…

MEDIUM 41CWE-772Published 2020-02-12 · Updated 2024-11-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-772.

Summary

A memory leak vulnerability exists in Cisco IOS before 15.2(1)T due to a memory leak in the HTTP PROXY Server process (aka CSCtu52820), when configured with Cisco ISR Web Security with Cisco ScanSafe and User Authenticaiton NTLM configured.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01014 63rd percentileScored 2026-11-07

Fix Fixed IOS (Cisco): 15.2(1)T

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	IOS	before 15.2(1)T	15.2(1)T	Patch available	CNA

IOS VendorCisco Affected before 15.2(1)T Fixed in 15.2(1)T Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios::::::::	before 15.2\(1\)t	Vulnerable	Cisco

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:* Versions before 15.2\(1\)t Vulnerable ·Cisco

Remediation

Fix · CNA IOS (Cisco) Fixed in 15.2(1)T

Timeline

2026-10-02 Threatist record created from CVE-2011-4661
2026-10-03 Alias added: GHSA-97hh-xg4h-8gvc

References

Advisory 1

https://www.cisco.com/c/en/us/td/docs/ios/15_2m_and_t/release/notes/15_2m_and_t/152-1TCAVS.html

TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8

See all 617 →

Sources

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