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CVE-2021-3762

32
FAUCET Score

CVE-2021-3762 is a critical directory traversal vulnerability in the ClairCore engine of Clair, affecting Red Hat Clair and Red Hat Quay. An unauthenticated attacker can exploit this by submitting a specially crafted container image, leading to arbitrary file write and potential remote code execution on the scanning system. With a CVSS score of 9.8 (Critical), this vulnerability poses a significant risk due to its network-based attack vector and low attack complexity. While no active exploitation, public exploit code, or significant community discussion has been observed, its high FAUCET Risk Score of 87/100 indicates its severe potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.4.6, < 0.4.8CPE matchmatch criteria
cpe:2.3:a:redhat:clair:*:*:*:*:*:*:*:*
>= 0.5.3, < 0.5.5CPE matchmatch criteria
cpe:2.3:a:redhat:clair:*:*:*:*:*:*:*:*
3.5.6CPE matchmatch criteria
cpe:2.3:a:redhat:quay:3.5.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.81%
Probability of exploitation in next 30 days
EPSS Percentile
91.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0481 is in the 85th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/quay/claircoreFixed in: 0.4.8
gopatch availablevia ghsa
Product: github.com/quay/claircoreFixed in: 1.1.0
gopatch availablevia ghsa
Product: github.com/quay/claircoreFixed in: 0.5.5
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Quay 3Fixed in: quay/clair-rhel8:v3.5.7-8
View patch

Vendor Advisories (2)

goGHSA-mq47-6wwv-v79whigh

Path traversal in claircore

Mar 4, 2022
redhatCVE-2021-3762Critical

quay/claircore: directory traversal when scanning crafted container image layer allows for arbitrary file write

Sep 28, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
github.com / quay/claircore/commit/691f2023a1720a0579e688b69a2f4bfe1f4b7821
PatchThird Party Advisory
github.com / quay/claircore/pull/478
PatchThird Party Advisory
github.com / quay/clair/pull/1379
PatchThird Party Advisory
github.com / quay/clair/pull/1380
PatchThird Party Advisory
vulmon.com / exploitdetails
ExploitThird Party Advisory