{"cve":"CVE-2013-1623","nvd":{"published":"2013-02-08T19:55:01.407","modified":"2026-06-16T23:51:47.867","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-310"],"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"],"products":["yassl:cyassl"],"source":"nvd","synced_at":"2026-10-19T20:27:27.940201468+00:00"},"epss":{"cve":"CVE-2013-1623","score":0.02424,"percentile":0.84198,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}