CVE-2025-43918Known exploitationPublic exploitNetwork attack vector

Unauthorized certificate issuance via email-domain propagation

Published Apr 19, 2025 · Updated Apr 21, 2025

Domain-control bypass in SSL.com before 2025-04-19 allows remote authenticated users to obtain TLS certificates for uncontrolled domains. The affected DCV callback extracts the domain from the approver's email address and propagates that email domain into a validation record instead of the requested domain. An SSL.com account, control of a DNS TXT record on one domain, and access to the listed email address are required; successful use misissues a trusted DV TLS certificate for the email domain.

CVSS severity6.4
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Domain-control bypass in SSL.com before 2025-04-19 allows remote authenticated users to obtain TLS certificates for uncontrolled domains. The affected DCV callback extracts the domain from the approver's email address and propagates that email domain into a validation record instead of the requested domain. An SSL.com account, control of a DNS TXT record on one domain, and access to the listed email address are required; successful use misissues a trusted DV TLS certificate for the email domain.

The record

CVE
CVE-2025-43918
Published
Apr 19, 2025
Updated
Apr 21, 2025
Vendor
SSL.com
Product
SSL.com
Classifications
CWE-348, T1588.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2025-04-19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SSL.com · SSL.comversion=0 <2025-04-19

Published CVSS scores

6.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-348Use of Less Trusted Source
T1588.004Obtain Capabilities: Digital Certificates

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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