Access Control Bypass Affecting traffic_server package, versions [9.0.0,9.2.11)[10.0.0,10.0.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Jul 2025
- disclosed19 Jun 2025
- creditMasakazu Kitajo
Introduced: 19 Jun 2025
CVE-2025-31698 (opens in a new tab)How to fix?
Upgrade traffic_server to version 9.2.11, 10.0.6 or higher.
Overview
Affected versions of this package are vulnerable to Access Control Bypass in the PROXY protocol process. An attacker can gain unauthorized access or perform actions with elevated privileges by sending crafted PROXY protocol headers to manipulate client IP information in ACL configurations.
Note:
This is only exploitable if the PROXY protocol is explicitly enabled and trusted for client IP information in ACL configurations.
Workaround
This vulnerability can be mitigated by using the new setting(proxy.config.acl.subjects to specify which IP addresses to use for the ACL if configured to accept the PROXY protocol.