CVE-2019-19313Public exploitNetwork attack vector

Discussion denial of service via malformed Markdown links

Published Jan 5, 2020 · Updated Aug 5, 2024

Denial of service in GitLab EE 12.3 and later allows remote authenticated users to disrupt issue and commit discussions via comments. A comment containing a Markdown link with a character above U+FFFD causes discussions.json to return HTTP 500 instead of rendering the thread. An account able to comment on a public project can make issue discussions unreadable and can also block commit comments and diffs from every viewer.

CVSS severity7.5
High
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GitLab EE 12.3 and later allows remote authenticated users to disrupt issue and commit discussions via comments. A comment containing a Markdown link with a character above U+FFFD causes discussions.json to return HTTP 500 instead of rendering the thread. An account able to comment on a public project can make issue discussions unreadable and can also block commit comments and diffs from every viewer.

The record

CVE
CVE-2019-19313
Published
Jan 5, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-755, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 5, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1499Endpoint Denial of Service

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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