Skip to main content
Live Webinar with SANS (June 25)— Agentic CTI Automation for Fun & ProfitRegister Free
Mallory
Medium

OSPF heap corruption DoS in Cisco Secure Firewall ASA/FTD

IdentifiersCVE-2026-20024CWE-787

A vulnerability in the OSPF protocol implementation of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software allows an authenticated adjacent attacker to trigger heap corruption during OSPF packet parsing. Exploitation requires knowledge of the OSPF secret key and is performed by sending crafted OSPF packets to the OSPF service, leading to heap corruption and an unexpected device reload (denial of service).

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause the affected ASA/FTD device to reload unexpectedly, resulting in a denial-of-service condition and loss of availability for firewall/routing functions until the device recovers.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Cisco SystemsAdaptive Security Appliance Softwareoperating_system
Cisco SystemsFirepower Threat Defense Softwareapplication
Cisco SystemsSecure Firewall Asa Softwareapplication
Cisco SystemsSecure Ftd Softwareapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity1

Community discussion across Reddit, Mastodon, and other social sources.