Privilege Escalation in F5OS-A and F5OS-C
CVE-2025-61955 is a high-severity privilege escalation vulnerability affecting F5OS-A and F5OS-C, the operating systems used by F5 rSeries appliances and VELOS chassis systems. According to the provided content, the flaw may allow an authenticated attacker with local access to escalate privileges and bypass Appliance mode restrictions, enabling the attacker to cross a security boundary. The supporting content attributes the issue to CWE-95, indicating improper neutralization of directives in dynamically evaluated code (eval injection), where insufficient sanitization or validation of user-supplied input can permit execution of malicious directives with elevated privileges.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in F5 BIG-IP products, details undisclosed, but considered critical due to the exposure of source code and risk of exploit acceleration.
An F5OS vulnerability (appliance mode) that could enable major compromise of F5OS-A and F5OS-C systems (CVSS up to 8.8).
A privilege escalation vulnerability in F5OS-A and F5OS-C systems that allows an authenticated local attacker to escalate privileges and cross security boundaries. The vulnerability is due to improper neutralization of directives in dynamically evaluated code (Eval Injection).
An F5OS-A/C privilege escalation vulnerability allowing an authenticated attacker to escalate privileges.
The version that knows your environment.
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.