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Fencer Vulns
medium 6.1

CVE-2020-25864 json

HashiCorp Consul Cross-site Scripting vulnerability

published 2021-04-20 5 y ago modified 2026-09-10 1 mo ago also BIT-consul-2020-25864 , EUVD-2022-3260 , GHSA-8xmx-h8rq-h94j , GO-2023-1851

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • go github.com/hashicorp/consul 1.7.14, 1.8.10, 1.9.5
  • bitnami consul 1.7.14, 1.8.10, 1.9.5
  • hashicorp consul 1.7.14, 1.8.10, 1.9.5
  • consul Debian 11 1.8.7+dfsg1-2

debian advisories DEBIAN-CVE-2020-25864

  • consul Alpine 3.18, Alpine 3.17, Alpine 3.16 +3 more 1.9.5-r0

alpine advisories ALPINE-CVE-2020-25864

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • consul Arch Linux 1.9.5-1

arch linux advisories AVG-1829

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25864 updated cvss 6.1

consul: specially crafted KV entry could be used to perform a XSS attack

  • Red Hat OpenShift Service Mesh 2.0 servicemesh, servicemesh-mixc, servicemesh-mixs, servicemesh-istioctl, servicemesh-prometheus, servicemesh-pilot-agent, +1 more Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/metrics-collector-rhel8, rhacm2/multicluster-observability-rhel8-operator Red Hat Fuse 7 consul-client consul-client Red Hat OpenShift Container Platform 4 openshift4/ose-prometheus, openshift4/cnf-tests-rhel8, redhat/redhat-operator-index, openshift4/compliance-rhel8-operator, openshift4/file-integrity-rhel8-operator, openshift4/ose-cluster-etcd-rhel8-operator, +3 more Red Hat OpenShift Virtualization 4 container-native-virtualization/hyperconverged-cluster-operator, container-native-virtualization/hostpath-provisioner-rhel8-operator, container-native-virtualization/hyperconverged-cluster-webhook-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.07% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template HashiCorp Consul/Consul Enterprise <=1.9.4 - Cross-Site Scripting nuclei detection template

CVSS scores

assigned by version score vector
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/hashicorp/consul
>=1.9.0, <1.9.5
>=1.8.0, <1.8.10
<1.7.14
1.9.5
1.8.10
1.7.14
bitnami consul
<1.7.14
>=1.8.0, <1.8.10
>=1.9.0, <1.9.5
1.7.14
1.8.10
1.9.5

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.