Denial of Service Vulnerability in wolfSSL TLS 1.3 Implementation
CVE-2020-12457

7.5HIGH

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
21 August 2020

What is CVE-2020-12457?

A vulnerability has been found in wolfSSL, specifically affecting its handling of the ChangeCipherSpec (CCS) message processing logic in TLS 1.3. An attacker can exploit this flaw by sending multiple sequential ChangeCipherSpec messages crafted in a specific way, leading the server to enter an infinite loop in the ProcessReply() function. This results in a denial of service, hindering server operations and impacting availability.

References

https://github.com/wolfSSL/wolfssl/pull/2927
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https://github.com/wolfSSL/wolfssl/releases/tag/v4.5.0-st...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.