CVE-2013-1623

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.

Published: 2013-02-08 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-1623 is rated Moderate Risk (41.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.94%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-1623

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 2.39% 0.94% -1.46%
2 2025-03-29 0.94% 2.39% +1.46%
3 2025-03-17 — 0.94% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-1623

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2013-1623

OS Trackers for CVE-2013-1623

vendor priority summary link
gentoo high CVE-2013-1623: 1 GLSA(s) (201308-06), 1 atom(s) (dev-db/mysql); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-1623
redhat medium — https://access.redhat.com/security/cve/CVE-2013-1623
ubuntu medium CVE-2013-1623 medium priority: Ubuntu including 3 source packages (mysql-5.1, mysql-5.5, mysql-dfsg-5.1), 21 status rows across 7 suites (hardy, lucid, oneiric, precise, quantal, raring, upstream): DNE 13, released 5, needs-triage 3. https://ubuntu.com/security/CVE-2013-1623

Affected software / configurations for CVE-2013-1623

Vendor Product Version Raw CPE
yassl cyassl <= 2.4.6 cpe:2.3:a:yassl:cyassl:*:*:*:*:*:*:*:*
yassl cyassl 0.2.0 cpe:2.3:a:yassl:cyassl:0.2.0:*:*:*:*:*:*:*
yassl cyassl 0.3.0 cpe:2.3:a:yassl:cyassl:0.3.0:*:*:*:*:*:*:*
yassl cyassl 0.4.0 cpe:2.3:a:yassl:cyassl:0.4.0:*:*:*:*:*:*:*
yassl cyassl 0.5.0 cpe:2.3:a:yassl:cyassl:0.5.0:*:*:*:*:*:*:*
yassl cyassl 0.5.5 cpe:2.3:a:yassl:cyassl:0.5.5:*:*:*:*:*:*:*
yassl cyassl 0.6.0 cpe:2.3:a:yassl:cyassl:0.6.0:*:*:*:*:*:*:*
yassl cyassl 0.6.2 cpe:2.3:a:yassl:cyassl:0.6.2:*:*:*:*:*:*:*
yassl cyassl 0.6.3 cpe:2.3:a:yassl:cyassl:0.6.3:*:*:*:*:*:*:*
yassl cyassl 0.8.0 cpe:2.3:a:yassl:cyassl:0.8.0:*:*:*:*:*:*:*
yassl cyassl 0.9.0 cpe:2.3:a:yassl:cyassl:0.9.0:*:*:*:*:*:*:*
yassl cyassl 0.9.6 cpe:2.3:a:yassl:cyassl:0.9.6:*:*:*:*:*:*:*
yassl cyassl 0.9.8 cpe:2.3:a:yassl:cyassl:0.9.8:*:*:*:*:*:*:*
yassl cyassl 0.9.9 cpe:2.3:a:yassl:cyassl:0.9.9:*:*:*:*:*:*:*
yassl cyassl 1.0.0 cpe:2.3:a:yassl:cyassl:1.0.0:rc1:*:*:*:*:*:*
yassl cyassl 1.0.0 cpe:2.3:a:yassl:cyassl:1.0.0:rc2:*:*:*:*:*:*
yassl cyassl 1.0.0 cpe:2.3:a:yassl:cyassl:1.0.0:rc3:*:*:*:*:*:*
yassl cyassl 1.0.2 cpe:2.3:a:yassl:cyassl:1.0.2:*:*:*:*:*:*:*
yassl cyassl 1.0.3 cpe:2.3:a:yassl:cyassl:1.0.3:*:*:*:*:*:*:*
yassl cyassl 1.0.6 cpe:2.3:a:yassl:cyassl:1.0.6:*:*:*:*:*:*:*
yassl cyassl 1.1.0 cpe:2.3:a:yassl:cyassl:1.1.0:*:*:*:*:*:*:*
yassl cyassl 1.2.0 cpe:2.3:a:yassl:cyassl:1.2.0:*:*:*:*:*:*:*
yassl cyassl 1.3.0 cpe:2.3:a:yassl:cyassl:1.3.0:*:*:*:*:*:*:*
yassl cyassl 1.4.0 cpe:2.3:a:yassl:cyassl:1.4.0:*:*:*:*:*:*:*
yassl cyassl 1.5.0 cpe:2.3:a:yassl:cyassl:1.5.0:*:*:*:*:*:*:*
yassl cyassl 1.5.4 cpe:2.3:a:yassl:cyassl:1.5.4:*:*:*:*:*:*:*
yassl cyassl 1.5.6 cpe:2.3:a:yassl:cyassl:1.5.6:*:*:*:*:*:*:*
yassl cyassl 1.6.0 cpe:2.3:a:yassl:cyassl:1.6.0:*:*:*:*:*:*:*
yassl cyassl 1.6.5 cpe:2.3:a:yassl:cyassl:1.6.5:*:*:*:*:*:*:*
yassl cyassl 1.8.0 cpe:2.3:a:yassl:cyassl:1.8.0:*:*:*:*:*:*:*
yassl cyassl 1.9.0 cpe:2.3:a:yassl:cyassl:1.9.0:*:*:*:*:*:*:*
yassl cyassl 2.0.0 cpe:2.3:a:yassl:cyassl:2.0.0:rc1:*:*:*:*:*:*
yassl cyassl 2.0.0 cpe:2.3:a:yassl:cyassl:2.0.0:rc2:*:*:*:*:*:*
yassl cyassl 2.0.0 cpe:2.3:a:yassl:cyassl:2.0.0:rc3:*:*:*:*:*:*
yassl cyassl 2.0.2 cpe:2.3:a:yassl:cyassl:2.0.2:*:*:*:*:*:*:*
yassl cyassl 2.0.6 cpe:2.3:a:yassl:cyassl:2.0.6:*:*:*:*:*:*:*
yassl cyassl 2.0.8 cpe:2.3:a:yassl:cyassl:2.0.8:*:*:*:*:*:*:*
yassl cyassl 2.2.0 cpe:2.3:a:yassl:cyassl:2.2.0:*:*:*:*:*:*:*
yassl cyassl 2.3.0 cpe:2.3:a:yassl:cyassl:2.3.0:*:*:*:*:*:*:*
yassl cyassl 2.4.0 cpe:2.3:a:yassl:cyassl:2.4.0:*:*:*:*:*:*:*

References for CVE-2013-1623

cvelogic Threat Intelligence