SB2026031001 - Multiple DoS vulnerabilities in Cisco ASA and Cisco FTD OSPF implementation

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Main Vulnerability Database SB2026031001

SB2026031001 - Multiple DoS vulnerabilities in Cisco ASA and Cisco FTD OSPF implementation

Published: March 10, 2026

Security Bulletin ID SB2026031001
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Adjecent network
Highest impact Denial of service

Breakdown by Severity

Medium 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Buffer overflow (CVE-ID: CVE-2026-20020)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to perform a denial of service attack.

The vulnerability exists due to a boundary error in the OSPF protocol. A remote user on the local network can send specially crafted OSPF update packets to the system, trigger memory corruption and perform a denial of service attack. 


2) Out-of-bounds write (CVE-ID: CVE-2026-20022)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when OSPF canonicalization debug is enabled. A remote attacker on the local network can send specially crafted OSPF packets to the affected device, trigger an out-of-bounds write and perform a denial of service (DoS) attack.


3) Heap-based buffer overflow (CVE-ID: CVE-2026-20024)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to perform a denial of service attack.

The vulnerability exists due to a boundary error when parsing OSPF packets. A remote user on the local network can send specially crafted OSPF packets to the affected device, trigger a heap-based buffer overflow and perform a denial of service attack.


4) Input validation error (CVE-ID: CVE-2026-20025)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing OSPF link-state update (LSU) packets. A remote user with OSPF secret key can send specially crafted OSPF LSU packets to the device and perform a denial of service (DoS) attack.


Remediation

Install update from vendor's website.

References