// For flags

CVE-2023-6936

Heap-buffer over-read with WOLFSSL_CALLBACKS

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).

En wolfSSL anterior a 5.6.6, si las funciones de devolución de llamada están habilitadas (a través del indicador WOLFSSL_CALLBACKS), entonces un cliente TLS malicioso o un atacante de red puede desencadenar una sobrelectura del búfer en el montón de 5 bytes (WOLFSSL_CALLBACKS solo está destinado a la depuración).

*Credits: Lucca Hirschi (Inria, LORIA), Steve Kremer (Inria, LORIA), Max Ammann (Trail of Bits), tlspuffin
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-12-18 CVE Reserved
  • 2024-02-20 CVE Published
  • 2025-03-26 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-126: Buffer Over-read
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
WolfSSL
Search vendor "WolfSSL"
 WolfSSL
Search vendor "WolfSSL" for product "WolfSSL"
 <= 5.6.5
Search vendor "WolfSSL" for product "WolfSSL" and version " <= 5.6.5"
en
Affected