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Fencer Vulns
high 7.5

CVE-2021-28156 json

HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events.

published 2021-04-20 5 y ago modified 2026-09-08 2 mo ago also BIT-consul-2021-28156 , EUVD-2021-14854

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

HashiCorp Consul Enterprise version 1.8.0 up to 1.9.4 audit log can be bypassed by specifically crafted HTTP events. Fixed in 1.9.5, and 1.8.10.

Patch / fix

  • bitnami consul 1.8.10, 1.9.5
  • hashicorp consul 1.8.10, 1.9.5
  • consul Alpine 3.18, Alpine 3.17, Alpine 3.16 +3 more 1.9.5-r0

alpine advisories ALPINE-CVE-2021-28156

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

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-2021-28156 updated cvss 7.5

consul: Audit log requests bypass

  • 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

2.29% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami consul
>=1.8.0, <1.8.10
>=1.9.0, <1.9.5
1.8.10
1.9.5

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.