CVE-2022-24741Public exploitNetwork attack vector

Service interruption via oversized image dimensions

Published Mar 9, 2022 · Updated Apr 22, 2025

Resource exhaustion in Nextcloud Server before 21.0.8, 22.0.0 through 22.2.3, and 23.0.0 allows remote authenticated users to interrupt service. The preview path trusts width and height values from image headers, causing PHP to allocate an image object from those dimensions without enforcing its normal memory limit. File-upload access and enabled preview generation are required; processing the crafted image can exhaust memory or CPU and interrupt the server.

CVSS severity3.5
Low
EPSS probability1.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Resource exhaustion in Nextcloud Server before 21.0.8, 22.0.0 through 22.2.3, and 23.0.0 allows remote authenticated users to interrupt service. The preview path trusts width and height values from image headers, causing PHP to allocate an image object from those dimensions without enforcing its normal memory limit. File-upload access and enabled preview generation are required; processing the crafted image can exhaust memory or CPU and interrupt the server.

The record

CVE
CVE-2022-24741
Published
Mar 9, 2022
Updated
Apr 22, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-770, CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record 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=< 21.0.8
  2. Affected versionversion=>= 22.0.0, < 22.2.4
  3. Affected versionversion=>= 23.0.0, < 23.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 21.0.8; version=>= 22.0.0, < 22.2.4; version=>= 23.0.0, < 23.0.1

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
3.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
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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