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CVE-2021-31232

18
FAUCET Score

CVE-2021-31232 describes a local file disclosure vulnerability in Alertmanager within CNCF Cortex versions prior to 1.8.1, specifically when the experimental.alertmanager.enable-api flag is active. An attacker with local access can exploit this by manipulating the HTTP basic auth password_file or Alertmanager templates to send arbitrary file content via a webhook. Rated as MEDIUM severity (CVSS 5.5), this vulnerability has low attack complexity and requires local privileges, potentially leading to high confidentiality impact. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.8.1CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:cortex:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 85th percentile among its peer group of 15,940 CVEs.

Social Chatter

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

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/cortexproject/cortexFixed in: 1.8.1

Vendor Advisories (2)

goGHSA-m45g-f45x-vv22medium

Improper input validation in CNCF Cortex

Jun 23, 2021
redhatCVE-2021-31232Moderate

cortex: Alertmanager can expose local files content via specially crafted config

Apr 28, 2021

References

community.grafana.com / c/security-announcements
Third Party Advisory
github.com / cortexproject/cortex
Third Party Advisory
github.com / cortexproject/cortex/pull/4129/files
PatchThird Party Advisory
lists.cncf.io / g/cortex-users/message/50
Release NotesVendor Advisory