CVE-2025-11932Network attack vector

PSK-binder information disclosure via timing differences

Published Nov 21, 2025 · Updated Nov 21, 2025

Timing side channel in wolfSSL before 5.8.4 allows remote authenticated users to infer PSK-binder information during TLS 1.3 handshakes. The TLS 1.3 server binder-verification path used a regular byte comparison instead of ConstantCompare, making mismatch position observable in response timing. Exploitation requires a PSK-enabled TLS 1.3 server, low privileges, and repeated timing measurements; the reported consequence is limited disclosure of binder information.

CVSS severity2.3
Low
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timing side channel in wolfSSL before 5.8.4 allows remote authenticated users to infer PSK-binder information during TLS 1.3 handshakes. The TLS 1.3 server binder-verification path used a regular byte comparison instead of ConstantCompare, making mismatch position observable in response timing. Exploitation requires a PSK-enabled TLS 1.3 server, low privileges, and repeated timing measurements; the reported consequence is limited disclosure of binder information.

The record

CVE
CVE-2025-11932
Published
Nov 21, 2025
Updated
Nov 21, 2025
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 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=5.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

wolfSSL · wolfSSLversion=5.8.4

Published CVSS scores

2.3wolfSSL Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-203Observable Discrepancy

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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