What is CVE-2020-25864?

CVE-2020-25864 is a medium-severity vulnerability in Hashicorp Consul, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-20.

How severe is CVE-2020-25864?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2020-25864 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Hashicorp Consul

CVE-2020-25864

HashiCorp Consul and Consul Enterprise up to version 1.9.4 key-value (KV) raw mode was vulnerable to cross-site scripting. Fixed in 1.9.5, 1.8.10 and 1.7.14.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.061 (93.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.061 · newest: 0.061 · change: -0.000

Affected products

Hashicorp Consul

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.hashicorp.com/blog/category/consul (Product, Vendor Advisory)
discuss.hashicorp.com/t/hcsec-2021-07-consul-api-kv-endpoint-vulnerable-to-cros… (Vendor Advisory)
security.gentoo.org/glsa/202208-09 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25864?: CVE-2020-25864 is a medium-severity vulnerability in Hashicorp Consul, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-20.
How severe is CVE-2020-25864?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-25864 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.