CVE-2025-55521Public exploitNetwork attack vector

Authenticated service interruption via invalid timezone setting

Published Aug 21, 2025 · Updated Aug 21, 2025

Denial of service in Akaunting 3.1.19 and earlier allows remote authenticated users to trigger HTTP 500 errors via a crafted POST request. The /settings/localisation handler accepts a nonexistent timezone, and app/Utilities/Overrider.php reads the saved value without validating it before applying it. Authenticated access to localisation settings is required; the invalid value persists, causing subsequent page loads to return HTTP 500 errors and interrupt service.

CVSS severity6.5
Medium
EPSS probability0.48%
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 Akaunting 3.1.19 and earlier allows remote authenticated users to trigger HTTP 500 errors via a crafted POST request. The /settings/localisation handler accepts a nonexistent timezone, and app/Utilities/Overrider.php reads the saved value without validating it before applying it. Authenticated access to localisation settings is required; the invalid value persists, causing subsequent page loads to return HTTP 500 errors and interrupt service.

The record

CVE
CVE-2025-55521
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2025Record 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

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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