CVE-2026-20024
Analyzed Analyzed - Analysis Complete

Heap Corruption in Cisco OSPF Causes DoS via Device Reload

Publication date: 2026-03-04

Last updated on: 2026-07-14

Assigner: Cisco Systems, Inc.

Description
A vulnerability in the OSPF protocol of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an authenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a DoS condition. To exploit this vulnerability, the attacker must have the OSPF secret key. This vulnerability is due to heap corruption in OSPF when parsing packets. An attacker could exploit this vulnerability by sending crafted packets to the OSPF service. A successful exploit could allow the attacker to corrupt the heap, causing the affected device to reload, resulting in a DoS condition.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published
2026-03-04
Last Modified
2026-07-14
Generated
2026-07-26
AI Q&A
2026-03-04
EPSS Evaluated
2026-07-25
NVD
CVE-2026-20024
EUVD
EUVD-2026-9481

Affected Vendors & Products

Showing 141 associated CPEs
Vendor Product Version / Range
cisco adaptive_security_appliance_software 9.16.1
cisco adaptive_security_appliance_software 9.12.2
cisco adaptive_security_appliance_software 9.12.2.5
cisco adaptive_security_appliance_software 9.12.4.4
cisco adaptive_security_appliance_software 9.12.3.2
cisco adaptive_security_appliance_software 9.12.3.7
cisco adaptive_security_appliance_software 9.12.4
cisco adaptive_security_appliance_software 9.12.3.12
cisco adaptive_security_appliance_software 9.12.4.37
cisco adaptive_security_appliance_software 9.12.4.38
cisco adaptive_security_appliance_software 9.12.4.39
cisco adaptive_security_appliance_software 9.17.1
cisco adaptive_security_appliance_software 9.12.3
cisco adaptive_security_appliance_software 9.12.3.9
cisco adaptive_security_appliance_software 9.12.4.26
cisco adaptive_security_appliance_software 9.12.4.30
cisco adaptive_security_appliance_software 9.16.1.28
cisco adaptive_security_appliance_software 9.17.1.7
cisco adaptive_security_appliance_software 9.16.3.14
cisco adaptive_security_appliance_software 9.16.4
cisco adaptive_security_appliance_software 9.18.2.5
cisco adaptive_security_appliance_software 9.17.1.10
cisco adaptive_security_appliance_software 9.17.1.13
cisco adaptive_security_appliance_software 9.18.1
cisco adaptive_security_appliance_software 9.18.1.3
cisco adaptive_security_appliance_software 9.12.1
cisco adaptive_security_appliance_software 9.12.1.2
cisco adaptive_security_appliance_software 9.12.1.3
cisco adaptive_security_appliance_software 9.12.4.10
cisco adaptive_security_appliance_software 9.12.4.13
cisco adaptive_security_appliance_software 9.12.4.8
cisco adaptive_security_appliance_software 9.12.4.18
cisco adaptive_security_appliance_software 9.16.2.3
cisco adaptive_security_appliance_software 9.16.2.7
cisco adaptive_security_appliance_software 9.16.2.11
cisco adaptive_security_appliance_software 9.16.2.13
cisco adaptive_security_appliance_software 9.16.2.14
cisco adaptive_security_appliance_software 9.17.1.11
cisco adaptive_security_appliance_software 9.17.1.15
cisco adaptive_security_appliance_software 9.12.4.2
cisco adaptive_security_appliance_software 9.17.1.9
cisco adaptive_security_appliance_software 9.12.2.4
cisco adaptive_security_appliance_software 9.12.2.9
cisco adaptive_security_appliance_software 9.12.2.1
cisco adaptive_security_appliance_software 9.12.4.7
cisco adaptive_security_appliance_software 9.12.4.24
cisco adaptive_security_appliance_software 9.12.4.29
cisco adaptive_security_appliance_software 9.12.4.35
cisco adaptive_security_appliance_software 9.16.2
cisco adaptive_security_appliance_software 9.16.3.3
cisco adaptive_security_appliance_software 9.16.3
cisco adaptive_security_appliance_software 9.18.2
cisco adaptive_security_appliance_software 9.19.1.9
cisco adaptive_security_appliance_software 9.19.1.5
cisco adaptive_security_appliance_software 9.19.1.18
cisco adaptive_security_appliance_software 9.19.1.12
cisco adaptive_security_appliance_software 9.19.1
cisco adaptive_security_appliance_software 9.18.3.55
cisco adaptive_security_appliance_software 9.18.3.53
cisco adaptive_security_appliance_software 9.18.3.46
cisco adaptive_security_appliance_software 9.18.3.39
cisco adaptive_security_appliance_software 9.18.3
cisco adaptive_security_appliance_software 9.18.2.8
cisco adaptive_security_appliance_software 9.18.2.7
cisco adaptive_security_appliance_software 9.17.1.30
cisco adaptive_security_appliance_software 9.17.1.20
cisco adaptive_security_appliance_software 9.16.4.9
cisco adaptive_security_appliance_software 9.16.4.38
cisco adaptive_security_appliance_software 9.16.4.27
cisco adaptive_security_appliance_software 9.16.4.19
cisco adaptive_security_appliance_software 9.16.4.14
cisco adaptive_security_appliance_software 9.16.3.23
cisco adaptive_security_appliance_software 9.16.3.19
cisco adaptive_security_appliance_software 9.16.3.15
cisco adaptive_security_appliance_software 9.12.4.58
cisco adaptive_security_appliance_software 9.12.4.56
cisco adaptive_security_appliance_software 9.12.4.55
cisco adaptive_security_appliance_software 9.12.4.54
cisco adaptive_security_appliance_software 9.12.4.52
cisco adaptive_security_appliance_software 9.12.4.50
cisco adaptive_security_appliance_software 9.12.4.48
cisco adaptive_security_appliance_software 9.12.4.47
cisco adaptive_security_appliance_software 9.12.4.41
cisco adaptive_security_appliance_software 9.12.4.40
cisco adaptive_security_appliance_software 9.12.4.62
cisco adaptive_security_appliance_software 9.12.4.65
cisco adaptive_security_appliance_software 9.16.4.39
cisco adaptive_security_appliance_software 9.16.4.42
cisco adaptive_security_appliance_software 9.16.4.48
cisco adaptive_security_appliance_software 9.16.4.55
cisco adaptive_security_appliance_software 9.17.1.33
cisco adaptive_security_appliance_software 9.18.3.56
cisco adaptive_security_appliance_software 9.18.4
cisco adaptive_security_appliance_software 9.18.4.5
cisco adaptive_security_appliance_software 9.18.4.8
cisco adaptive_security_appliance_software 9.19.1.22
cisco adaptive_security_appliance_software 9.19.1.24
cisco adaptive_security_appliance_software 9.19.1.27
cisco adaptive_security_appliance_software 9.20.1
cisco adaptive_security_appliance_software 9.20.1.5
cisco adaptive_security_appliance_software 9.20.2
cisco adaptive_security_appliance_software 9.20.2.21
cisco adaptive_security_appliance_software 9.20.2.10
cisco adaptive_security_appliance_software 9.19.1.31
cisco adaptive_security_appliance_software 9.19.1.28
cisco adaptive_security_appliance_software 9.18.4.24
cisco adaptive_security_appliance_software 9.18.4.22
cisco adaptive_security_appliance_software 9.17.1.39
cisco adaptive_security_appliance_software 9.16.4.61
cisco adaptive_security_appliance_software 9.16.4.57
cisco adaptive_security_appliance_software 9.12.4.67
cisco adaptive_security_appliance_software 9.20.3
cisco adaptive_security_appliance_software 9.18.4.40
cisco adaptive_security_appliance_software 9.16.4.70
cisco adaptive_security_appliance_software 9.16.4.67
cisco adaptive_security_appliance_software 9.20.2.22
cisco adaptive_security_appliance_software 9.18.4.34
cisco adaptive_security_appliance_software 9.18.4.29
cisco adaptive_security_appliance_software 9.16.4.62
cisco adaptive_security_appliance_software 9.20.3.4
cisco adaptive_security_appliance_software 9.20.3.7
cisco adaptive_security_appliance_software 9.22.1.1
cisco adaptive_security_appliance_software 9.23.1
cisco adaptive_security_appliance_software 9.16.4.71
cisco adaptive_security_appliance_software 9.16.4.76
cisco adaptive_security_appliance_software 9.16.4.82
cisco adaptive_security_appliance_software 9.17.1.45
cisco adaptive_security_appliance_software 9.17.1.46
cisco adaptive_security_appliance_software 9.18.4.47
cisco adaptive_security_appliance_software 9.18.4.50
cisco adaptive_security_appliance_software 9.18.4.52
cisco adaptive_security_appliance_software 9.18.4.53
cisco adaptive_security_appliance_software 9.19.1.37
cisco adaptive_security_appliance_software 9.19.1.38
cisco adaptive_security_appliance_software 9.20.3.10
cisco adaptive_security_appliance_software 9.20.3.13
cisco adaptive_security_appliance_software 9.20.3.16
cisco adaptive_security_appliance_software 9.20.3.9
cisco adaptive_security_appliance_software 9.22.1.2
cisco adaptive_security_appliance_software 9.22.1.3
cisco adaptive_security_appliance_software 9.22.1.6

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

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Executive Summary

This vulnerability exists in the OSPF protocol implementation of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software. It is caused by heap corruption when parsing OSPF packets. An authenticated attacker who is adjacent to the device and has the OSPF secret key can send specially crafted packets to the OSPF service, which can corrupt the heap and cause the affected device to reload unexpectedly.

Detection Guidance

I don't know

Impact Analysis

The primary impact of this vulnerability is a denial-of-service (DoS) condition. An attacker exploiting this flaw can cause the affected device to reload unexpectedly, disrupting network operations and potentially causing downtime.

Compliance Impact

I don't know

Mitigation Strategies

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