CVE-2025-1477Public exploitNetwork attack vector

Server crash via unbounded integration fields

Published Aug 13, 2025 · Updated Aug 13, 2025

Resource exhaustion in GitLab CE/EE allows remote attackers to crash or make the service unresponsive through Mattermost integration APIs. The Mattermost Slash Commands trigger endpoint accepts unbounded user_name, team_domain, and chat_name values and allocates memory for oversized request data. No GitLab account is required, but Mattermost Slash Commands must be enabled and the request must carry its integration token; memory exhaustion can crash the server.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in GitLab CE/EE allows remote attackers to crash or make the service unresponsive through Mattermost integration APIs. The Mattermost Slash Commands trigger endpoint accepts unbounded user_name, team_domain, and chat_name values and allocates memory for oversized request data. No GitLab account is required, but Mattermost Slash Commands must be enabled and the request must carry its integration token; memory exhaustion can crash the server.

The record

CVE
CVE-2025-1477
Published
Aug 13, 2025
Updated
Aug 13, 2025
Vendor
GitLab
Product
GitLab
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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?

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

  1. Affected versionversion=18.1 <18.1.4
  2. Affected versionversion=18.2 <18.2.2
  3. Affected versionversion=8.14 <18.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GitLab · GitLabversion=18.1 <18.1.4; version=18.2 <18.2.2; version=8.14 <18.0.6

Published CVSS scores

6.5GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

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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