CVE-2023-33760Public exploitNetwork attack vector

Communication disclosure via shared default TLS certificate

Published Jan 25, 2024 · Updated Jun 17, 2025

Improper certificate validation in SpliceCom Maximiser Soft PBX 1.5 and earlier allows attackers to eavesdrop on SSL Gateway traffic. The SSL Gateway installs a vendor-supplied self-signed certificate without prompting administrators to replace it, while supported clients trust that certificate by default. Exploitation requires interception and redirection of a client connection, exposing authentication credentials and other gateway communications carried inside the TLS session.

CVSS severity5.3
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in SpliceCom Maximiser Soft PBX 1.5 and earlier allows attackers to eavesdrop on SSL Gateway traffic. The SSL Gateway installs a vendor-supplied self-signed certificate without prompting administrators to replace it, while supported clients trust that certificate by default. Exploitation requires interception and redirection of a client connection, exposing authentication credentials and other gateway communications carried inside the TLS session.

The record

CVE
CVE-2023-33760
Published
Jan 25, 2024
Updated
Jun 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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

5.3NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
5.3CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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.

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

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-295Improper Certificate Validation
T1557Adversary-in-the-Middle

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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