CVE-2023-25267Public exploitNetwork attack vector

Authenticated mail-server crash via unsafe email copy

Published Mar 15, 2023 · Updated Feb 27, 2025

Stack-based buffer overflow in GFI Kerio Connect 9.4.1 patch 1 allows remote authenticated users to crash the mail server via webmail. The webmail 2FASetup path copies the user-controlled primaryEMailAddress value with strcpy into a fixed 128-byte stack buffer. Any unprivileged authenticated webmail account can reach the JSON-RPC method over the network; the demonstrated consequence is a mailserver process crash and restart.

CVSS severity8.8
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in GFI Kerio Connect 9.4.1 patch 1 allows remote authenticated users to crash the mail server via webmail. The webmail 2FASetup path copies the user-controlled primaryEMailAddress value with strcpy into a fixed 128-byte stack buffer. Any unprivileged authenticated webmail account can reach the JSON-RPC method over the network; the demonstrated consequence is a mailserver process crash and restart.

The record

CVE
CVE-2023-25267
Published
Mar 15, 2023
Updated
Feb 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 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

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
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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