yaSSL: TLS CBC padding timing attack
Published Feb 8, 2013
4.3
MEDIUMCVSS 2.0
EPSS 2.42%
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
No data.
- ≤ 2.4.6
- 0.2.0
- 0.3.0
- 0.4.0
- 0.5.0
- 0.5.5
- 0.6.0
- 0.6.2
- 0.6.3
- 0.8.0
- 0.9.0
- 0.9.6
- 0.9.8
- 0.9.9
- 1.0.0
- 1.0.0
- 1.0.0
- 1.0.2
- 1.0.3
- 1.0.6
- 1.1.0
- 1.2.0
- 1.3.0
- 1.4.0
- 1.5.0
- 1.5.4
- 1.5.6
- 1.6.0
- 1.6.5
- 1.8.0
- 1.9.0
- 2.0.0
- 2.0.0
- 2.0.0
- 2.0.2
- 2.0.6
- 2.0.8
- 2.2.0
- 2.3.0
- 2.4.0
No data.
Red Hat Enterprise Linux 5
mysql
Not affected
Red Hat Enterprise Linux 6
mysql
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | mysql | Not affected | n/a |
| Red Hat Enterprise Linux 6 | mysql | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of mysql as shipped with Red Hat Enterprise Linux 5 or 6. The packages use OpenSSL and not yaSSL.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.42% (0.02424) | 83.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.42% (0.02424) | 82.00th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.94% (0.00935) | 74.08th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.39% (0.02391) | 75.02th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.94% (0.00935) | 74.56th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.32% (0.00324) | 71.58th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.32% (0.00324) | 69.93th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.32% (0.00324) | 66.04th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
References (10)
- http://openwall.com/lists/oss-security/2013/02/05/24 mailing-listx_refsource_MLIST
- http://secunia.com/advisories/53372 third-party-advisoryx_refsource_SECUNIA
- http://security.gentoo.org/glsa/glsa-201308-06.xml vendor-advisoryx_refsource_GENTOO
- http://www.isg.rhul.ac.uk/tls/
- http://www.isg.rhul.ac.uk/tls/TLStiming.pdf x_refsource_MISC
- 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 x_refsource_CONFIRM
- https://access.redhat.com/security/cve/CVE-2013-1623 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=908445 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2013-1623
- https://www.cve.org/CVERecord?id=CVE-2013-1623
| Link | Providers | Tags |
|---|---|---|
| http://openwall.com/lists/oss-security/2013/02/05/24 | mailing-listx_refsource_MLIST | |
| http://secunia.com/advisories/53372 | third-party-advisoryx_refsource_SECUNIA | |
| http://security.gentoo.org/glsa/glsa-201308-06.xml | vendor-advisoryx_refsource_GENTOO | |
| http://www.isg.rhul.ac.uk/tls/ | ||
| http://www.isg.rhul.ac.uk/tls/TLStiming.pdf | x_refsource_MISC | |
| 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 | x_refsource_CONFIRM | |
| https://access.redhat.com/security/cve/CVE-2013-1623 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=908445 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-1623 | ||
| https://www.cve.org/CVERecord?id=CVE-2013-1623 |
Change history (0)
No recorded changes yet.