CVE-2024-52520Network attack vector

Service interruption via unbounded OpenGraph response download

Published Nov 15, 2024 · Updated Nov 15, 2024

Resource exhaustion in Nextcloud Server 28.0.0 through 28.0.9 and 29.0.0 through 29.0.6 allows remote authenticated users to interrupt service. LinkReferenceProvider trusts the HEAD response's Content-Length, then converts the complete GET body to a string for OpenGraph parsing without enforcing its 5 MiB limit. Exploitation requires authenticated access and user interaction to trigger link resolution; oversized response consumption can interrupt the server without reading or changing data.

CVSS severity5.7
Medium
EPSS probability0.79%
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 Nextcloud Server 28.0.0 through 28.0.9 and 29.0.0 through 29.0.6 allows remote authenticated users to interrupt service. LinkReferenceProvider trusts the HEAD response's Content-Length, then converts the complete GET body to a string for OpenGraph parsing without enforcing its 5 MiB limit. Exploitation requires authenticated access and user interaction to trigger link resolution; oversized response consumption can interrupt the server without reading or changing data.

The record

CVE
CVE-2024-52520
Published
Nov 15, 2024
Updated
Nov 15, 2024
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-79, CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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?

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

  1. Affected versionversion=>= 28.0.0, < 28.0.10
  2. Affected versionversion=>= 29.0.0, < 29.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 28.0.0, < 28.0.10; version=>= 29.0.0, < 29.0.7

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
5.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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