CVE-2021-40346
15Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 58%
exploitation probability
58%top 1% of all CVEs
observed exploitation
nono source reports it
An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.
Affected products
n/a · n/aReferences
https://git.haproxy.org/?p=haproxy.githttps://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95https://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021-40346-integer-overflow-enables-http-smuggling/https://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3Ehttps://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/https://www.debian.org/security/2021/dsa-4968https://www.mail-archive.com/haproxy%40formilux.orghttps://www.mail-archive.com/haproxy%40formilux.org/msg41114.html