CVE-2020-25017

Name: CVE-2020-25017
Creator: NVD / NIST
Published: 2020-10-01T17:15:13.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.3/10EPSS 1.30%

Last modified Jun 17, 2026

CVE-2020-25017 is a high-severity vulnerability rated 8.3/10 on the CVSS scale. Envoy through 1.15.0 only considers the first value when multiple header values are present for some HTTP headers. Envoy’s setCopy() header map API does not replace all existing occurences of a non-inline header.. EPSS estimates a 1.30% chance of exploitation in the next 30 days.

Description

Envoy through 1.15.0 only considers the first value when multiple header values are present for some HTTP headers. Envoy’s setCopy() header map API does not replace all existing occurences of a non-inline header.

Metrics

CVSS 3.1

8.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

EPSS Probability

1.30%

66.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	< 1.12.7
Envoyproxy	Envoy	>= 1.13.0, < 1.13.4
Envoyproxy	Envoy	>= 1.14.0, < 1.14.4
Envoyproxy	Envoy	>= 1.15.0, < 1.15.1

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-2v25-cjjq-5f4wExploit, Third Party Advisory
https://groups.google.com/forum/#%21forum/envoy-security-announce
https://github.com/envoyproxy/envoy/security/advisories/GHSA-2v25-cjjq-5f4wExploit, Third Party Advisory
https://groups.google.com/forum/#%21forum/envoy-security-announce

Timeline

Published: Oct 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25017?

How severe is CVE-2020-25017?

CVE-2020-25017 has a CVSS score of 8.3/10 (HIGH severity). The EPSS model estimates a 1.30% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25017?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-25017?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST