TI-2019-08902 Aliases CVE-2019-11873 GHSA-6rpx-83hc-92h9

wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity…

MEDIUM 54CWE-787Published 2019-05-23 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity size is greater than a client identity size. An attacker sends a crafted hello client packet over the network to a TLSv1.3 wolfSSL server. The length fields of the packet: record length, client hello length, total extensions length, PSK extension length, total identity length, and identity length contain their maximum value which is 2^16. The identity data field of the PSK extension of the packet contains the attack data, to be stored in the undefined memory (RAM) of the server. The size of the data is about 65 kB. Possibly the attacker can perform a remote code execution attack.

Why it matters now

EPSS 0.09249 95th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wolfssl:wolfssl:4.0:-::::::	4.0	Vulnerable	wolfSSL

cpe:2.3:a:wolfssl:wolfssl:4.0:-:*:*:*:*:*:* Versions 4.0 Vulnerable ·wolfSSL

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2019-11873
2026-10-03 Alias added: GHSA-6rpx-83hc-92h9

References

Patch 1

https://www.telekom.com/resource/blob/572524/1c89c1cbaccdf792153063b3a10af10e/dl-190515-remote-buffer-overflow-vulnerability-wolfssl-library-data.pdf

Advisory 1

https://www.telekom.com/en/corporate-responsibility/data-protection-data-security/security/details/advisories-504842

TI-2024-00830 SEGV and out of bounds memory read from malicious packet CVSS 3.1CRITICAL 9.1
TI-2022-18557 In wolfSSL before 5.5.1, malicious clients can cause a buffer overflow during a TLS 1.3… CVSS 3.1HIGH 7.5
TI-2025-10943 Potential DoS Vulnerability through Multiple KeyShareEntry with Same Group in TLS 1.3 ClientHello CVSS 4.0MEDIUM 6.3
TI-2017-09737 wolfSSL Bleichenbacher/ROBOT CVSS 3.0HIGH 7.5
TI-2017-02021 Improper certificate validation in wolfSSL CVSS 3.1CRITICAL 9.8
TI-2022-20901 In wolfSSL before 5.5.2, if callback functions are enabled (via the WOLFSSL_CALLBACKS… CVSS 3.1CRITICAL 9.1

See all 150 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences