CVE-2024-23656Public exploitNetwork attack vector

Traffic decryption via discarded TLS configuration

Published Jan 25, 2024 · Updated Jun 3, 2025

Inadequate encryption in Dex 2.37.0 allows remote attackers to decrypt HTTPS traffic by negotiating TLS 1.0 or TLS 1.1. The HTTPS server in cmd/dex/serve.go sets a TLS 1.2 minimum, but the certificate reloader discards that configuration and its cipher-suite restrictions. Exploitation requires the HTTPS listener and a client using a deprecated protocol; the reported consequence is disclosure of traffic to Dex.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Inadequate encryption in Dex 2.37.0 allows remote attackers to decrypt HTTPS traffic by negotiating TLS 1.0 or TLS 1.1. The HTTPS server in cmd/dex/serve.go sets a TLS 1.2 minimum, but the certificate reloader discards that configuration and its cipher-suite restrictions. Exploitation requires the HTTPS listener and a client using a deprecated protocol; the reported consequence is disclosure of traffic to Dex.

The record

CVE
CVE-2024-23656
Published
Jan 25, 2024
Updated
Jun 3, 2025
Vendor
Dex
Product
Dex
Classifications
CWE-757, CWE-326, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 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== 2.37.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dex · Dexversion== 2.37.0

Published CVSS scores

7.5GitHub, Inc.CVSS: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-757Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
CWE-326Inadequate Encryption Strength
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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