CVE-2022-37452Public exploitNetwork attack vector

Remote heap corruption via undersized alias arrays

Published Aug 7, 2022 · Updated Aug 3, 2024

Heap-based buffer overflow in Exim before 4.95 allows remote attackers to corrupt heap memory during reverse-DNS host-name lookup. The host_name_lookup function underallocates alias-pointer arrays by omitting space for the terminating NULL, so the terminator is written past the heap allocation. The flaw is reachable when sender_host_name is set and lookup returns aliases; demonstrated impact is a server crash, while code execution is not established.

CVSS severity9.8
Critical
EPSS probability3.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Exim before 4.95 allows remote attackers to corrupt heap memory during reverse-DNS host-name lookup. The host_name_lookup function underallocates alias-pointer arrays by omitting space for the terminating NULL, so the terminator is written past the heap allocation. The flaw is reachable when sender_host_name is set and lookup returns aliases; demonstrated impact is a server crash, while code execution is not established.

The record

CVE
CVE-2022-37452
Published
Aug 7, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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 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-787Out-of-bounds Write
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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