CVE-2020-25017
CVSS v3
8.3
HIGH
EPSS Score
1.3 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2020-10-01
Frequently asked questions
What is CVE-2020-25017?
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.
Is CVE-2020-25017 actively exploited?
Active exploitation of CVE-2020-25017 has not been confirmed. Its EPSS score was 1.3% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-25017?
CVE-2020-25017 has a CVSS v3 base score of 8.3 (HIGH severity).
Is CVE-2020-25017 affecting your environment?
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