NULL dereference in SSL_CIPHER_find() function on unknown cipher ID
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 10 fixed, 7 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-476.
Summary
Issue summary: If an application using the SSL_CIPHER_find() function in a QUIC protocol client or server receives an unknown cipher suite from the peer, a NULL dereference occurs. Impact summary: A NULL pointer dereference leads to abnormal termination of the running process causing Denial of Service. Some applications call SSL_CIPHER_find() from the client_hello_cb callback on the cipher ID received from the peer. If this is done with an SSL object implementing the QUIC protocol, NULL pointer dereference will happen if the examined cipher ID is unknown or unsupported. As it is not very common to call this function in applications using the QUIC protocol and the worst outcome is Denial of Service, the issue was assessed as Low severity. The vulnerable code was introduced in the 3.2 version with the addition of the QUIC protocol support. The FIPS modules in 3.6, 3.5, 3.4 and 3.3 are not affected by this issue, as the QUIC implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4 and 3.3 are vulnerable to this issue. OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenSSL | OpenSSL | 3.6.0 to before 3.6.1; 3.5.0 to before 3.5.5; 3.4.0 to before 3.4.4; 3.3.0 to before 3.3.6 | 3.6.1, 3.5.5, 3.4.4, 3.3.6 | Patch available | CNA |
- OpenSSL VendorOpenSSL Affected 3.6.0 to before 3.6.1; 3.5.0 to before 3.5.5; 3.4.0 to before 3.4.4; 3.3.0 to before 3.3.6 Fixed in 3.6.1, 3.5.5, 3.4.4, 3.3.6 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* | 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.4; 3.5.0 to before 3.5.5; 3.6.0 to before 3.6.1 | Vulnerable | OpenSSL |
- cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* Versions 3.3.0 to before 3.3.6; 3.4.0 to before 3.4.4; 3.5.0 to before 3.5.5; 3.6.0 to before 3.6.1 Vulnerable ·OpenSSL
Remediation
- Fix · CNA OpenSSL (OpenSSL) Fixed in 3.6.1, 3.5.5, 3.4.4, 3.3.6
Red Hat 12 advisories
- RHSA-2026:82857 Released 2026-10-14 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-bundle
- RHSA-2026:82372 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-operator-rhel9
- RHSA-2026:82354 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/cert-manager-istio-csr-rhel9
Show 9 more Red Hat advisories
- RHSA-2026:82347 Released 2026-10-13 · Red Hat rating Importantcert-manager Operator for Red Hat OpenShift 1.18.2
- Cert Manager support for Red Hat OpenShift release 1.18 registry.redhat.io/cert-manager/jetstack-cert-manager-acmesolver-rhel9, registry.redhat.io/cert-manager/jetstack-cert-manager-rhel9
- RHSA-2026:7261 Released 2026-04-09 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images openssl-3.5.6-0.1.hum1@aarch64, openssl-3.5.6-0.1.hum1@src, openssl-3.5.6-0.1.hum1@x86_64 +10
- RHSA-2026:4943 Released 2026-03-18 · Red Hat rating ImportantRed Hat Update Infrastructure 5.1 security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
- RHSA-2026:3228 Released 2026-02-24 · Red Hat rating ImportantCost Management Metrics Operator Update
- Cost Management 4 registry.redhat.io/costmanagement/costmanagement-metrics-rhel9-operator
- RHSA-2026:2563 Released 2026-02-11 · Red Hat rating ImportantRed Hat Update Infrastructure 5 security update
- Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
- RHSA-2026:2485 Released 2026-02-10 · Red Hat rating ImportantInsights proxy Container Image
- Red Hat Insights proxy 1.5 registry.redhat.io/insights-proxy/insights-proxy-container-rhel9
- RHSA-2026:1736 Released 2026-02-02 · Red Hat rating ImportantA Subscription Management tool for finding and reporting Red Hat product usage
- Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
- RHSA-2026:1473 Released 2026-01-28 · Red Hat rating Importantopenssl security update
- Red Hat Enterprise Linux AppStream (v. 9) openssl-devel-1:3.5.1-7.el9_7, openssl-perl-1:3.5.1-7.el9_7
- Red Hat Enterprise Linux BaseOS (v. 9) openssl-1:3.5.1-7.el9_7, openssl-libs-1:3.5.1-7.el9_7
- RHSA-2026:1472 Released 2026-01-28 · Red Hat rating Importantopenssl security update
- Red Hat Enterprise Linux AppStream (v. 10) openssl-devel-1:3.5.1-7.el10_1, openssl-perl-1:3.5.1-7.el10_1
- Red Hat Enterprise Linux BaseOS (v. 10) openssl-1:3.5.1-7.el10_1, openssl-libs-1:3.5.1-7.el10_1
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
OpenSSL — openssl-library.org/news/secadv/20260127.txt
12 records Highest priority Priority CRITICAL 1 CRITICAL, 3 MEDIUM, 8 LOW
Other records, highest priority first
- TI-2025-14107 Stack buffer overflow in CMS (Auth)EnvelopedData parsingPriority CRITICAL 85
- TI-2025-10249 Improper validation of PBMAC1 parameters in PKCS#12 MAC verificationPriority MEDIUM 62
- TI-2025-42864 NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex functionPriority MEDIUM 41
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Core Services | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Cert Manager support for Red Hat OpenShift release 1.18 | Fixed | RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857 |
| Cost Management 4 | Fixed | RHSA-2026:3228 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:1736 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:1472 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:1473 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:1472 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:1473 |
| Red Hat Hardened Images | Fixed | RHSA-2026:7261 |
| Red Hat Insights proxy 1.5 | Fixed | RHSA-2026:2485 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:2563, RHSA-2026:4943 |
Not affected: 2 products
- Cost Management 4
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2025-15468
- 2026-10-03 Alias added: GHSA-rhx3-fg8p-f9m4
- 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
- 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.18 · Red Hat
References
More Openssl vulnerabilities
- TI-2022-01915 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2021-02645 SM2 Decryption Buffer Overflow CVSS 3.1CRITICAL 9.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
- TI-2022-01176 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2014-00154 The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly… KEVCVSS 3.1HIGH 7.5
- TI-2025-14107 Stack buffer overflow in CMS (Auth)EnvelopedData parsing CVSS 3.1HIGH 8.8
Sources
- CVE-2025-15468 · CVE Program
- CVE-2025-15468 · NVD
- FIRST EPSS
- GHSA-rhx3-fg8p-f9m4 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-15468 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences