CVE-2025-11936

published 2025-11-21

CVE-2025-11936: Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a…

Priority P4 32 medium 5.3 CVSS 3.1

AV N AC L PR N UI N S U C N I N A L

Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
debian	wolfssl	< wolfssl 5.8.4-1 (forky)	wolfssl 5.8.4-1 (forky)
msrc	azl3_mariadb_10.11.11-1_on_azure_linux_3.0	—	—
msrc	cbl2_mariadb_10.6.21-1_on_cbl_mariner_2.0	—	—
wolfssl	wolfssl	>= 0 < 5.8.4-1	5.8.4-1
wolfssl	wolfssl	>= 3.12.0 < 5.8.4	5.8.4
wolfssl	wolfssl	>= 5.8.2 < 5.8.4	5.8.4

CVSS provenance

nvd v3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

nvd v4.0 6.3 MEDIUM CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

osv 6.3 MEDIUM

vendor_debian 6.3 MEDIUM

vendor_msrc 5.3 MEDIUM

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CWE-20