CVE-2018-17452Network attack vector

Unauthenticated SSRF via unvalidated loopback addresses

Published Apr 15, 2023 · Updated Feb 6, 2025

SSRF in GitLab Community and Enterprise Edition before 11.1.7 allows remote attackers to send requests to loopback services. The validate_localhost function in url_blocker.rb fails to reject a crafted loopback address before GitLab issues the outbound request. No authentication or user interaction is required; affected 11.2.x before 11.2.4 and 11.3.x before 11.3.1 instances can be induced to contact services bound to localhost.

CVSS severity9.8
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in GitLab Community and Enterprise Edition before 11.1.7 allows remote attackers to send requests to loopback services. The validate_localhost function in url_blocker.rb fails to reject a crafted loopback address before GitLab issues the outbound request. No authentication or user interaction is required; affected 11.2.x before 11.2.4 and 11.3.x before 11.3.1 instances can be induced to contact services bound to localhost.

The record

CVE
CVE-2018-17452
Published
Apr 15, 2023
Updated
Feb 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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