How many CVEs does hMailServer have?

hMailServer has 29 published CVE records since 2008, including 27 in the last two years.

How many hMailServer CVEs are in CISA KEV?

None of hMailServer's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.

Which hMailServer products have the most CVEs?

The hMailServer products with the most published CVEs are hmailserver, hMailServer 5.8.6, hMailServer 5.6.9-beta.

What are the most common weakness types in hMailServer CVEs?

hMailServer's CVEs most often map to these CWE weakness types: CWE-407 (Inefficient Algorithmic Complexity), CWE-122 (Heap-based Buffer Overflow), CWE-321 (Use of Hard-coded Cryptographic Key), CWE-770 (Allocation of Resources Without Limits or Throttling).

Are there public exploits for hMailServer vulnerabilities?

Yes — 5 of hMailServer's CVEs have a known public exploit.

What is the average severity of hMailServer CVEs?

The average CVSS base score across hMailServer's scored CVEs is 6.5.

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29 CVEs

hMailServer Vulnerabilities

Name: hMailServer vulnerability dataset (CVEs)
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

CVE security advisories and vulnerability history for hMailServer.

29

Total CVEs

Published

0

In CISA KEV

Exploited in the wild

5

Public exploits

PoC or exploit code

6.5

Avg CVSS

2008–2026

Overview

hMailServer has 29 published CVE records since 2008, of which 0 are in CISA's Known Exploited Vulnerabilities catalog and 5 have a known public exploit. The average CVSS base score across scored CVEs is 6.5.

Security scorecard

A quick read on hMailServer's vulnerability posture, as a share of its 29 published CVEs.

Average CVSS: 6.5
Critical / high: 45%
Actively exploited (KEV): 0%
Public exploit available: 17%
Patch available: 83%

Severity and exploitation

How the CVSS severity of hMailServer's CVEs breaks down, plus how many are exploited in the wild or have public exploit code.

Critical0

High13

Medium16

Low0

In CISA’s Known Exploited Vulnerabilities catalog

0

None of hMailServer's CVEs are currently listed in CISA's KEV catalog.

Public exploits

5

5 of hMailServer's CVEs have a known public exploit available.

Most affected products

The hMailServer products with the most published CVEs. Follow any product to browse its versions and vulnerabilities.

Common weakness types

The CWE weakness categories most often found in hMailServer CVEs. Follow any weakness for its full explanation.

CNAs that assign these CVEs

The CVE Numbering Authorities that publish hMailServer CVE records.

Disclosure activity by year

How many hMailServer CVEs were published each year.

2008

1

2020

1

2025

3

2026

24

Latest hMailServer CVEs

The most recently disclosed vulnerabilities affecting hMailServer.

Allocation of Resources Without Limits or Throttling in hMailServer
CWE-770
Medium · CVSS 4.3
EPSS 0.3%2026-10-08
Allocation of Resources Without Limits or Throttling in hMailServer
CWE-770
Medium · CVSS 5.3
EPSS 0.4%2026-10-08
Not Failing Securely ('Failing Open') in hMailServer
CWE-636
High · CVSS 7.4
EPSS 0.2%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
Medium · CVSS 6.5
EPSS 0.3%2026-10-08
Improper Certificate Validation in hMailServer
CWE-295
Medium · CVSS 5.9
EPSS 0.2%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
Medium · CVSS 6.5
EPSS 0.3%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
Medium · CVSS 6.5
EPSS 0.2%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
Medium · CVSS 6.5
EPSS 0.3%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
High · CVSS 7.5
EPSS 0.3%2026-10-08
Improper Link Resolution Before File Access ('Link Following') in hMailServer
CWE-59
Medium · CVSS 6.7
EPSS 0.1%2026-10-08
Inefficient Algorithmic Complexity in hMailServer
CWE-407
High · CVSS 7.5
EPSS 0.4%2026-10-08
Loop with Unreachable Exit Condition ('Infinite Loop') in hMailServer
CWE-835
High · CVSS 7.5
EPSS 0.4%2026-10-08

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Other vendors

CVE counts for other vendors.

microsoft41,739 CVEs linux25,260 CVEs Google17,495 CVEs Apple15,495 CVEs Oracle13,348 CVEs Debian10,233 CVEs IBM9,452 CVEs Red Hat8,581 CVEs

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Frequently asked questions

Common questions about hMailServer vulnerabilities.

How many CVEs does hMailServer have?: hMailServer has 29 published CVE records since 2008, including 27 in the last two years.
How many hMailServer CVEs are in CISA KEV?: None of hMailServer's CVEs are currently listed in CISA's Known Exploited Vulnerabilities catalog.
Which hMailServer products have the most CVEs?: The hMailServer products with the most published CVEs are hmailserver, hMailServer 5.8.6, hMailServer 5.6.9-beta.
What are the most common weakness types in hMailServer CVEs?: hMailServer's CVEs most often map to these CWE weakness types: CWE-407 (Inefficient Algorithmic Complexity), CWE-122 (Heap-based Buffer Overflow), CWE-321 (Use of Hard-coded Cryptographic Key), CWE-770 (Allocation of Resources Without Limits or Throttling).
Are there public exploits for hMailServer vulnerabilities?: Yes — 5 of hMailServer's CVEs have a known public exploit.
What is the average severity of hMailServer CVEs?: The average CVSS base score across hMailServer's scored CVEs is 6.5.

References

Vulnerability data is sourced from the CVE Program; severity, KEV, and exploit signals are aggregated by RadicalNotion.AI.

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