CVE-2023-25162Public exploitNetwork attack vector

AWS metadata disclosure via Unicode IP bypass

Published Feb 13, 2023 · Updated Mar 10, 2025

SSRF in Nextcloud Server and Enterprise Server before 23.0.12 or 24.0.8 allows remote attackers to read AWS metadata. The LocalAddressChecker filter accepts Unicode-enclosed decimal IP forms without canonicalizing them, so the disguised host resolves to a blocked link-local address. An unauthenticated network request can reach 169.254.169.254 when the server runs in AWS, exposing metadata returned by that service.

CVSS severity5.3
Medium
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Nextcloud Server and Enterprise Server before 23.0.12 or 24.0.8 allows remote attackers to read AWS metadata. The LocalAddressChecker filter accepts Unicode-enclosed decimal IP forms without canonicalizing them, so the disguised host resolves to a blocked link-local address. An unauthenticated network request can reach 169.254.169.254 when the server runs in AWS, exposing metadata returned by that service.

The record

CVE
CVE-2023-25162
Published
Feb 13, 2023
Updated
Mar 10, 2025
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=< 23.0.12
  2. Affected versionversion=>= 24.0.0, < 24.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=< 23.0.12; version=>= 24.0.0, < 24.0.8

Published CVSS scores

5.3GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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-918Server-Side Request Forgery (SSRF)
T1552.005Unsecured Credentials: Cloud Instance Metadata API

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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