CVE-2021-22167Public exploitNetwork attack vector

Repository disclosure via incorrect archive cache headers

Published Jan 15, 2021 · Updated Aug 3, 2024

Information exposure in GitLab allows remote attackers to read member-only repository archives over HTTP under affected releases. The repository archive response uses incorrect cache headers, allowing an archive generated for an authorized member to be served temporarily to unauthenticated requests. Exploitation requires a public project with repository access restricted to members and a member archive request while an attacker repeatedly polls its predictable URL.

CVSS severity5.3
Medium
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in GitLab allows remote attackers to read member-only repository archives over HTTP under affected releases. The repository archive response uses incorrect cache headers, allowing an archive generated for an authorized member to be served temporarily to unauthenticated requests. Exploitation requires a public project with repository access restricted to members and a member archive request while an attacker repeatedly polls its predictable URL.

The record

CVE
CVE-2021-22167
Published
Jan 15, 2021
Updated
Aug 3, 2024
Vendor
GitLab
Product
GitLab
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=12.1, <13.5.6
  2. Affected versionversion=>=13.6, <13.6.4
  3. Affected versionversion=>=13.7, <13.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=>=12.1, <13.5.6; version=>=13.6, <13.6.4; version=>=13.7, <13.7.2

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.3GitLab Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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