CVE-2026-4733Network attack vector

Private DH exponent disclosure via missing subgroup check

Published Mar 24, 2026 · Updated Mar 24, 2026

Information disclosure in IX-Ray Team's IX-Ray Engine 1.6 before 1.3 allows remote attackers to recover a reused private DH exponent. The bundled OpenSSL dh_check.c omits the subgroup check for non-safe-prime parameters, accepting crafted peer values that expose the exponent across repeated handshakes. Exploitation requires non-safe-prime DH parameters and multiple handshakes that reuse the same private exponent; no data modification or service interruption is reported.

CVSS severity3.7
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IX-Ray Team's IX-Ray Engine 1.6 before 1.3 allows remote attackers to recover a reused private DH exponent. The bundled OpenSSL dh_check.c omits the subgroup check for non-safe-prime parameters, accepting crafted peer values that expose the exponent across repeated handshakes. Exploitation requires non-safe-prime DH parameters and multiple handshakes that reuse the same private exponent; no data modification or service interruption is reported.

The record

CVE
CVE-2026-4733
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
IX-Ray Team
Product
IX-Ray Engine 1.6
Classifications
CWE-200, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record 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 <1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IX-Ray Team · IX-Ray Engine 1.6version=0 <1.3

Published CVSS scores

3.7Government Technology Agency of Singapore Cyber Security GroupCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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-200Exposure of Sensitive Information to an Unauthorized Actor
T1557Adversary-in-the-Middle

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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