CVE-2024-48938Network attack vector

Email-parsing denial of service via inefficient regex

Published Oct 11, 2024 · Updated Mar 14, 2025

Regular expression denial of service in Znuny LTS 6.0, 6.5.1 through 6.5.10, and 7.0.1 through 7.0.16 allows remote attackers to block email parsing. The email content parser applies an inefficient regular expression to crafted Microsoft Word HTML, driving high CPU use and stalling the parsing process. Remote attackers trigger the availability impact by delivering a crafted HTML email; no data disclosure or modification is reported.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Znuny LTS 6.0, 6.5.1 through 6.5.10, and 7.0.1 through 7.0.16 allows remote attackers to block email parsing. The email content parser applies an inefficient regular expression to crafted Microsoft Word HTML, driving high CPU use and stalling the parsing process. Remote attackers trigger the availability impact by delivering a crafted HTML email; no data disclosure or modification is reported.

The record

CVE
CVE-2024-48938
Published
Oct 11, 2024
Updated
Mar 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1333, CAPEC-492, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 14, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CAPEC-492Regular Expression Exponential Blowup
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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