CVE-2025-15468Network attack vectorHinoki check available

QUIC process crash via unchecked cipher lookup

Published Jan 27, 2026 · Updated Jan 27, 2026

NULL pointer dereference in OpenSSL allows remote attackers to crash a QUIC client or server by sending an unknown or unsupported cipher suite. The ossl_quic_get_cipher_by_char helper fails to check whether cipher lookup returned NULL before dereferencing the SSL_CIPHER object. Reachability requires an application to pass a peer-supplied cipher ID from client_hello_cb to SSL_CIPHER_find on a QUIC SSL object; the resulting process termination causes a service interrupt.

CVSS severity5.9
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in OpenSSL allows remote attackers to crash a QUIC client or server by sending an unknown or unsupported cipher suite. The ossl_quic_get_cipher_by_char helper fails to check whether cipher lookup returned NULL before dereferencing the SSL_CIPHER object. Reachability requires an application to pass a peer-supplied cipher ID from client_hello_cb to SSL_CIPHER_find on a QUIC SSL object; the resulting process termination causes a service interrupt.

The record

CVE
CVE-2025-15468
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 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=3.3.0 <3.3.6
  2. Affected versionversion=3.4.0 <3.4.4
  3. Affected versionversion=3.5.0 <3.5.5
  4. Affected versionversion=3.6.0 <3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=3.3.0 <3.3.6; version=3.4.0 <3.4.4; version=3.5.0 <3.5.5; version=3.6.0 <3.6.1

Published CVSS scores

5.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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