TI-2021-01228 Aliases CVE-2021-1501 GHSA-g39j-8m48-qwgj

Insufficient session expiration in Cisco Adaptive Security Appliance Software

MEDIUM 46CWE-613Published 2021-04-29 · Updated 2024-11-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-613.

Summary

A vulnerability in the SIP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.The vulnerability is due to a crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a crash and reload of the affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01352 71st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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	Cisco Adaptive Security Appliance (ASA) Software	all versions	—	No fix listed	CNA

Cisco Adaptive Security Appliance (ASA) Software VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::	6.2.2 to before 6.4.0.12; 6.5.0 to before 6.6.4; 6.7.0 to before 6.7.0.2	Vulnerable	Cisco
cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::	9.8 to before 9.8.4.34; 9.9 to before 9.9.2.85; 9.10 to before 9.12.4.18; 9.13 to before 9.13.1.21; 9.14 to before 9.14.2.13; 9.15 to before 9.15.1.15	Vulnerable	Cisco

cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* Versions 6.2.2 to before 6.4.0.12; 6.5.0 to before 6.6.4; 6.7.0 to before 6.7.0.2 Vulnerable ·Cisco
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* Versions 9.8 to before 9.8.4.34; 9.9 to before 9.9.2.85; 9.10 to before 9.12.4.18; 9.13 to before 9.13.1.21; 9.14 to before 9.14.2.13; 9.15 to before 9.15.1.15 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-1501
2026-10-03 Alias added: GHSA-g39j-8m48-qwgj

References

Advisory 1

20210428 Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software SIP Denial of Service Vulnerability

TI-2025-14628 Buffer overflow in Cisco Secure Firewall Adaptive Security Appliance Software KEVCVSS 3.1CRITICAL 9.9
TI-2016-05454 Buffer overflow in Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3 on… KEVCVSS 3.1HIGH 8.8
TI-2023-06973 Authentication bypass in Cisco Adaptive Security Appliance Software KEVCVSS 3.1CRITICAL 9.1
TI-2026-82192 Denial of service in Cisco Secure Firewall ASA and FTD SSL VPN KEVCVSS 3.1HIGH 8.6
TI-2026-16533 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense… KEVCVSS 3.1HIGH 8.6
TI-2025-14657 Missing authorization in Cisco Secure Firewall Adaptive Security Appliance Software KEVCVSS 3.1HIGH 8.6

See all 354 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences