A vulnerability in the AnyConnect SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an implementation error within the SSL/TLS session handling process that can prevent the release of a session handler under specific conditions. An attacker could exploit this vulnerability by sending crafted SSL/TLS traffic to an affected device, increasing the probability of session handler leaks. A successful exploit could allow the attacker to eventually deplete the available session handler pool, preventing new sessions from being established and causing a DoS condition.
Metrics
Affected Vendors & Products
Advisories
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2023-24221 | A vulnerability in the AnyConnect SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an implementation error within the SSL/TLS session handling process that can prevent the release of a session handler under specific conditions. An attacker could exploit this vulnerability by sending crafted SSL/TLS traffic to an affected device, increasing the probability of session handler leaks. A successful exploit could allow the attacker to eventually deplete the available session handler pool, preventing new sessions from being established and causing a DoS condition. |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Tue, 11 Aug 2026 20:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisco secure Firewall Threat Defense
|
|
| CPEs | cpe:2.3:a:cisco:firepower_threat_defense:7.0.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.4:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.0.5:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.2.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.2.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.2.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.3.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1:*:*:*:*:*:*:* |
cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.4:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.0.5:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:*:*:*:*:*:*:* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:*:*:*:*:*:*:* |
| Vendors & Products |
Cisco firepower Threat Defense
|
Cisco secure Firewall Threat Defense
|
Projects
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Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2024-08-02T08:57:35.839Z
Reserved: 2022-10-27T18:47:50.316Z
Link: CVE-2023-20042
No data.
Status : Modified
Published: 2023-11-01T18:15:08.843
Modified: 2026-08-11T19:33:44.513
Link: CVE-2023-20042
No data.
OpenCVE Enrichment
No data.
Weaknesses
EUVD