TI-2026-16420 Aliases CVE-2026-20222 GHSA-3p99-hh66-cfh4

Memory leak in Cisco Secure Firewall Adaptive Security Appliance Software

LOW 32CWE-401Published 2026-09-16 · Updated 2026-09-18

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
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-401.

Summary

A vulnerability in the EIGRP implementation in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper resource management when handling EIGRP update messages. An attacker could exploit this vulnerability by sending crafted EIGRP updates at a high rate to an affected device. A successful exploit could allow the attacker to trigger a memory leak that will eventually cause the affected device to reload unexpectedly.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00254 17th 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: No
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 Secure Firewall Adaptive Security Appliance (ASA) Software	9.19.1; 9.19.1.5; 9.19.1.9; 9.19.1.12; 9.19.1.18; 9.20.1; 9.19.1.22; 9.20.1.5; 9.19.1.24; 9.20.2; 9.19.1.27; 9.20.2.10; 9.19.1.28; 9.20.2.21; 9.19.1.31; 9.20.2.22; 9.20.3; 9.23.1; 9.22.1.1; 9.20.3.4; 9.20.3.7; 9.19.1.37; 9.20.3.9; 9.19.1.38; 9.22.1.3; 9.20.3.10; 9.22.1.2; 9.20.3.13; 9.22.1.6; 9.22.2; 9.20.3.16; 9.19.1.42; 9.23.1.3; 9.20.3.20; 9.22.2.4; 9.23.1.7; 9.20.4; 9.22.2.9; 9.23.1.13; 9.20.4.7; 9.22.2.13; 9.20.4.10; 9.23.1.19; 9.22.2.14; 9.24.1; 9.23.1.22; 9.20.4.14; 9.22.2.20; 9.20.4.19; 9.23.1.26; 9.22.2.32; 9.22.3; 9.24.1.5; 9.20.4.22; 9.24.1.9; 9.20.4.28; 9.22.3.5; 9.23.1.195; 9.20.4.30; 9.24.1.155; 9.23.1.32; 9.24.1.11; 9.20.4.34; 9.20.4.235	—	No fix listed	CNA
Cisco	Cisco Secure Firewall Threat Defense (FTD) Software	7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1; 7.7.0; 7.4.2.2; 7.6.1; 7.4.2.3; 7.6.2; 7.7.10; 7.7.11; 7.6.2.1; 7.7.10.1; 7.4.2.4; 7.4.3; 7.6.4; 10.0.0; 7.4.4; 7.4.7	—	No fix listed	CNA

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software VendorCisco Affected 9.19.1; 9.19.1.5; 9.19.1.9; 9.19.1.12; 9.19.1.18; 9.20.1; 9.19.1.22; 9.20.1.5; 9.19.1.24; 9.20.2; 9.19.1.27; 9.20.2.10; 9.19.1.28; 9.20.2.21; 9.19.1.31; 9.20.2.22; 9.20.3; 9.23.1; 9.22.1.1; 9.20.3.4; 9.20.3.7; 9.19.1.37; 9.20.3.9; 9.19.1.38; 9.22.1.3; 9.20.3.10; 9.22.1.2; 9.20.3.13; 9.22.1.6; 9.22.2; 9.20.3.16; 9.19.1.42; 9.23.1.3; 9.20.3.20; 9.22.2.4; 9.23.1.7; 9.20.4; 9.22.2.9; 9.23.1.13; 9.20.4.7; 9.22.2.13; 9.20.4.10; 9.23.1.19; 9.22.2.14; 9.24.1; 9.23.1.22; 9.20.4.14; 9.22.2.20; 9.20.4.19; 9.23.1.26; 9.22.2.32; 9.22.3; 9.24.1.5; 9.20.4.22; 9.24.1.9; 9.20.4.28; 9.22.3.5; 9.23.1.195; 9.20.4.30; 9.24.1.155; 9.23.1.32; 9.24.1.11; 9.20.4.34; 9.20.4.235 Fixed in — No fix listed CNA
Cisco Secure Firewall Threat Defense (FTD) Software VendorCisco Affected 7.3.0; 7.3.1; 7.3.1.1; 7.4.0; 7.4.1; 7.4.1.1; 7.3.1.2; 7.6.0; 7.4.2; 7.4.2.1; 7.7.0; 7.4.2.2; 7.6.1; 7.4.2.3; 7.6.2; 7.7.10; 7.7.11; 7.6.2.1; 7.7.10.1; 7.4.2.4; 7.4.3; 7.6.4; 10.0.0; 7.4.4; 7.4.7 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::	—	—	Cisco

cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* Versions — — ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-20222
2026-10-03 Alias added: GHSA-3p99-hh66-cfh4

References

Other 1

cisco-sa-asaftd-eigrp-dos-GOhNejSj

TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
TI-2026-53490 Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0

See all 7059 →

Sources

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