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CVE-2021-28156

24
FAUCET Score

CVE-2021-28156 describes a bypass vulnerability in the audit log of HashiCorp Consul Enterprise versions 1.8.0 through 1.9.4, allowing specifically crafted HTTP events to evade logging. This vulnerability carries a high CVSS score of 7.5, indicating a network-exploitable flaw with low attack complexity that could lead to high integrity impact, though without confidentiality or availability impact. While no active exploitation, public exploit code, or significant community discussion has been observed, affected organizations should upgrade to Consul Enterprise 1.9.5 or 1.8.10 to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.8.0, < 1.8.10CPE matchmatch criteria
cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*
>= 1.9.0, < 1.9.5CPE matchmatch criteria
cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.27%
Probability of exploitation in next 30 days
EPSS Percentile
81.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0227 is in the 67th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2021-28156Moderate

consul: Audit log requests bypass

Apr 16, 2021

References

discuss.hashicorp.com / t/hcsec-2021-08-consul-enterprise-audit-log-bypass-for-http-events/23369
Vendor Advisory
security.gentoo.org / glsa/202208-09
Third Party Advisory
hashicorp.com / blog/category/consul
Vendor Advisory