What’s Vulnerable › Vulnerabilities

CVE-2013-1623

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2013-02-08 · updated 2026-06-16
• Weakness: CWE-310

Description

The TLS and DTLS implementations in wolfSSL CyaSSL before 2.5.0 do not properly consider timing side-channel attacks on a noncompliant MAC check operation during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, a related issue to CVE-2013-0169.

Affected products

• Yassl Cyassl: through 2.4.6; 0.2.0, 0.3.0, 0.4.0, 0.5.0, 0.5.5, 0.6.0 (+33)

References

• http://openwall.com/lists/oss-security/2013/02/05/24
• http://secunia.com/advisories/53372
• http://security.gentoo.org/glsa/glsa-201308-06.xml
• http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
• http://www.yassl.com/yaSSL/Blog/Entries/2013/2/5_WolfSSL%2C_provider_of_CyaSSL_Embedded_SSL%2C_releases_first_embedded_TLS_and_DTLS_protocol_fix_for_Lucky_Thirteen_Attack.html
• http://openwall.com/lists/oss-security/2013/02/05/24
• http://secunia.com/advisories/53372
• http://security.gentoo.org/glsa/glsa-201308-06.xml
• http://www.isg.rhul.ac.uk/tls/TLStiming.pdf
• http://www.yassl.com/yaSSL/Blog/Entries/2013/2/5_WolfSSL%2C_provider_of_CyaSSL_Embedded_SSL%2C_releases_first_embedded_TLS_and_DTLS_protocol_fix_for_Lucky_Thirteen_Attack.html

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