Malware hunters at U.K.-based NCC Group are raising the alarm for mass scanning and “multiple exploitation attempts” with exploits targeting critical security flaws in the F5 enterprise networking infrastructure products.

The vulnerabilities were patched on March 10 and are considered high-priority fixes because of the risk of exposure to authentication bypass and remote code execution attacks.

Less than a week after the release of the patches, proof-of-concept code started circulating and, over the last weekend, NCC Group’s researchers said its honeypot infrastructure was being hit with exploitation attempts.