Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software IKEv1 Denial of Service Vulnerability
Priority MEDIUM 47CWE-399Published · Updated
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
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
A vulnerability in the Internet Key Exchange version 1 (IKEv1) feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper management of system memory. An attacker could exploit this vulnerability by sending malicious IKEv1 traffic to an affected device. The attacker does not need valid credentials to authenticate the VPN session, nor does the attacker's source address need to match a peer statement in the crypto map applied to the ingress interface of the affected device. An exploit could allow the attacker to exhaust system memory resources, leading to a reload of an affected device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01985 80th 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 · 36
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | 9.7 to before 9.8.4.10 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* | 9.9 to before 9.9.2.47; 9.10 to before 9.10.1.30; 9.12 to before 9.12.2.5 | Vulnerable | Cisco |
| cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* | 6.2.0 to before 6.2.3.11; 6.3.0 to before 6.3.0.2 | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5505_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5505_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5510_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5510_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5510:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5512-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
- cpe:2.3:a:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* Versions 9.7 to before 9.8.4.10 Vulnerable ·Cisco
- cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* Versions 9.9 to before 9.9.2.47; 9.10 to before 9.10.1.30; 9.12 to before 9.12.2.5 Vulnerable ·Cisco
- cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:* Versions 6.2.0 to before 6.2.3.11; 6.3.0 to before 6.3.0.2 Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5505_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5505_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5510_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5510_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5510:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5512-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
Show 26 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:asa_5512-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5515-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5515-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5520_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5520_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5520:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5525-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5525-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5540_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5540_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5540:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5545-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5545-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5550_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5550_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5550:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5555-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5555-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:asa_5580_firmware:9.9\(2.4\):*:*:*:*:*:*:* | 9.9(2.4) | Vulnerable | Cisco |
| cpe:2.3:o:cisco:asa_5580_firmware:201.4\(1.21\):*:*:*:*:*:*:* | 201.4(1.21) | Vulnerable | Cisco |
| cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:asa_5512-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5515-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5515-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5520_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5520_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5520:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5525-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5525-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5540_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5540_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5540:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5545-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5545-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5550_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5550_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5550:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5555-x_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5555-x_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:asa_5580_firmware:9.9\(2.4\):*:*:*:*:*:*:* Versions 9.9(2.4) Vulnerable ·Cisco
- cpe:2.3:o:cisco:asa_5580_firmware:201.4\(1.21\):*:*:*:*:*:*:* Versions 201.4(1.21) Vulnerable ·Cisco
- cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Cisco Adaptive Security Appliance (ASA) Software n/a
8 records Highest priority Priority MEDIUM 4 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2019-09493 Uncontrolled resource consumption in Cisco Adaptive Security Appliance SoftwarePriority MEDIUM 43
- TI-2019-09474 Integer underflow in Cisco Adaptive Security Appliance SoftwarePriority MEDIUM 43
- TI-2019-09469 Memory corruption in Cisco Adaptive Security Appliance SoftwarePriority MEDIUM 42
Timeline
- 2026-10-02 Threatist record created from CVE-2019-15256
- 2026-10-03 Alias added: GHSA-5p28-46mx-rrvx
References
More Cisco Adaptive Security Appliance Software vulnerabilities
- 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
Sources
- CVE-2019-15256 · CVE Program
- CVE-2019-15256 · NVD
- FIRST EPSS
- GHSA-5p28-46mx-rrvx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences