CVE-2013-1623
CVE-2013-1623 is a medium-severity vulnerability in Yassl Cyassl with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.
Key facts
- Severity: Medium (CVSS 2.0 base score 4.3)
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-310
- Affected product: Yassl Cyassl
- Published:
- Last 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.
Frequently asked questions
- What is 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.
- How severe is CVE-2013-1623?
- CVE-2013-1623 has a CVSS 2.0 base score of 4.3, rated medium severity.
- Is CVE-2013-1623 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2013-1623?
- CVE-2013-1623 primarily affects Yassl Cyassl. In total, 40 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2013-1623?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2013-1623 published?
- CVE-2013-1623 was published on 2013-02-08 and last updated on 2026-06-16.
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
Affected products (40)
- cpe:2.3:a:yassl:cyassl:*:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.4.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.5.5:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.6.2:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.6.3:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.8.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.9.6:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.9.8:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:0.9.9:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.0.6:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.4.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.5.4:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.5.6:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.6.5:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.8.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:1.9.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.6:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.0.8:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:yassl:cyassl:2.4.0:*:*:*:*:*:*:*
More vulnerabilities in Yassl Cyassl
- CVE-2014-2900 — Medium (CVSS 5.8): wolfSSL CyaSSL before 2.9.4 does not properly validate X.509 certificates with unknown critical extensions, which…
- CVE-2014-2899 — Medium (CVSS 5.0): wolfSSL CyaSSL before 2.9.4 allows remote attackers to cause a denial of service (NULL pointer dereference) via (1) a…
- CVE-2012-1558 — Medium (CVSS 5.0): yaSSL CyaSSL before 2.0.8 allows remote attackers to cause a denial of service (NULL pointer dereference and…
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