Denial of service in Envoy

1) Input validation error

EUVDB-ID: #VU105934

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-30157

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when handling local replies in HTTP ext_proc process. A remote attacker can send specially crafted request to the server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

envoy: 1.0.0 - 1.33.0

CPE2.3

• cpe:2.3:a:cncf:envoy:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.19.5:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.29.12:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.33.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.5.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:cncf:envoy:1.9.1:*:*:*:*:*:*:*

External links

https://github.com/envoyproxy/envoy/security/advisories/GHSA-cf3q-gqg7-3fm9
https://github.com/envoyproxy/envoy/releases/tag/v1.32.4
https://github.com/envoyproxy/envoy/releases/tag/v1.31.6
https://github.com/envoyproxy/envoy/releases/tag/v1.30.10

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.