CVE-2026-20049
Cisco Adaptive Security Appliance Software 9.18.1 – 9.18.4.66
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HSummary
CVE-2026-20049 is a high-severity Incorrect Calculation of Buffer Size (CWE-131) vulnerability in Cisco Adaptive Security Appliance Software. Its CVSS base score is 7.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 21th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to SC-5 (Denial-of-service Protection) and SI-13 (Predictable Failure Prevention) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-20049 is a vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic within Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. The issue stems from the allocation of an insufficiently sized block of memory, classified under CWE-131, and carries a CVSS v3.1 base score of 7.7 (AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).
An authenticated remote attacker can exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device, provided they possess valid credentials to establish a VPN connection. Successful exploitation triggers an unexpected reload of the device, resulting in a denial-of-service (DoS) condition.
For mitigation details, including available patches and workarounds, refer to the Cisco Security Advisory at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9436
Vulnerability Data
A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker…
more
to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vulnerability enables authenticated remote DoS via crafted IPsec traffic exploiting memory allocation flaw in VPN processing (directly maps to Application or System Exploitation subtechnique).
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the memory allocation vulnerability by requiring timely installation of vendor patches for the affected Cisco ASA/FTD software.
Prevents DoS exploitation by implementing rate limiting or connection limits on IPsec VPN traffic to block crafted GCM-encrypted IKEv2 packets.
Implements controls to prevent predictable failure modes, such as insufficient memory allocation during IPsec traffic processing, from causing device reloads.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly prevent buffer-size miscalculations via coding standards, reviews, and testing, while fixing this single weakness only partially fulfills the broader control.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Secure coding standards directly require correct buffer-size calculations.
Security testing can detect buffer-size errors before release.
Secure development lifecycle mandates size-checking practices that reduce buffer-size miscalculations.
Application security requirements can specify buffer-size validation rules.
Secure architecture principles include safe memory-allocation guidelines.