CVE-2025-53603Public exploitNetwork attack vector

Unauthenticated process crash via duplicate request parameter

Published Jul 5, 2025 · Updated Jan 26, 2026

NULL pointer dereference in Alinto SOPE SOGo 2.0.2 through 5.12.2 allows remote attackers to crash SOGo with a crafted request. SOPE clones POST form parameters into an NGHashMap without preserving its root->last pointer, then dereferences that NULL pointer when merging a duplicate query-string key. No authentication or user interaction is required, and the demonstrated consequence is termination of the SOGo process rather than data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Alinto SOPE SOGo 2.0.2 through 5.12.2 allows remote attackers to crash SOGo with a crafted request. SOPE clones POST form parameters into an NGHashMap without preserving its root->last pointer, then dereferences that NULL pointer when merging a duplicate query-string key. No authentication or user interaction is required, and the demonstrated consequence is termination of the SOGo process rather than data disclosure or modification.

The record

CVE
CVE-2025-53603
Published
Jul 5, 2025
Updated
Jan 26, 2026
Vendor
Alinto
Product
SOPE
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 2026Record 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=SOGo 2.0.2 <=5.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alinto · SOPEversion=SOGo 2.0.2 <=5.12.2

Published CVSS scores

7.5MITRECVSS: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.

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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-476NULL Pointer Dereference
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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