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CVE-2025-53521 is an unauthenticated remote code execution vulnerability in F5 BIG-IP Access Policy Manager (APM). It affects the data-plane APM daemon when an APM access policy is assigned to a virtual server. An unauthenticated remote attacker can send specific malicious traffic to the affected virtual server to execute code. F5 initially characterized the issue as a denial-of-service vulnerability, then reclassified it as RCE in March 2026 after confirming exploitation. A precise underlying weakness has not been publicly established in the available information.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
209 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously fixed BIG-IP APM vulnerability mentioned only to clarify that its prior fix does not remediate CVE-2026-94127.
A prior F5 APM vulnerability mentioned only to clarify that systems patched for it may still require the CVE-2026-94127 hotfix.
An unauthenticated remote-code-execution vulnerability in F5 BIG-IP Access Policy Manager (APM), linked by F5 to the activity involving the PoisonedRefresh rootkit campaign.
Критична, неавтентицирана ранливост за далечинско извршување код во F5 BIG-IP Access Policy Manager (APM) кога access policy е конфигурирана на виртуелен сервер. Првично била класифицирана како denial-of-service, но подоцна е прекласифицирана како RCE и е потврдена експлоатација во дивината.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.