CVE-2019-25364Public exploitNetwork attack vector

Unauthenticated code execution via oversized POP3 username

Published Feb 18, 2026 · Updated Feb 18, 2026

Stack-based buffer overflow in TABS Laboratories MailCarrier 2.51 allows remote attackers to execute arbitrary code through POP3. The POP3 USER command handler accepts a roughly 5 KB username without enforcing the destination stack-buffer boundary, allowing saved control flow to be overwritten. No authentication or user interaction is required; a crafted request to the listening POP3 service can run attacker-supplied code on the Windows host.

CVSS severity9.3
Critical
EPSS probability0.83%
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 TABS Laboratories MailCarrier 2.51 allows remote attackers to execute arbitrary code through POP3. The POP3 USER command handler accepts a roughly 5 KB username without enforcing the destination stack-buffer boundary, allowing saved control flow to be overwritten. No authentication or user interaction is required; a crafted request to the listening POP3 service can run attacker-supplied code on the Windows host.

The record

CVE
CVE-2019-25364
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
TABS Laboratories Corporation
Product
MailCarrier
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=2.51

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TABS Laboratories Corporation · MailCarrierversion=2.51

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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