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CVE-2013-1623

16
FAUCET Score

CVE-2013-1623 describes a timing side-channel vulnerability in the TLS and DTLS implementations of wolfSSL CyaSSL versions prior to 2.5.0. This flaw, related to CVE-2013-0169, allows remote attackers to perform distinguishing and plaintext-recovery attacks by analyzing timing data from crafted packets exploiting a noncompliant MAC check during malformed CBC padding processing. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity with potential for partial confidentiality impact, but no integrity or availability impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.4.6CPE matchmatch criteria
cpe:2.3:a:yassl:cyassl:*:*:*:*:*:*:*:*
0.2.0CPE matchmatch criteria
cpe:2.3:a:yassl:cyassl:0.2.0:*:*:*:*:*:*:*
0.3.0CPE matchmatch criteria
cpe:2.3:a:yassl:cyassl:0.3.0:*:*:*:*:*:*:*
0.4.0CPE matchmatch criteria
cpe:2.3:a:yassl:cyassl:0.4.0:*:*:*:*:*:*:*
0.5.0CPE matchmatch criteria
cpe:2.3:a:yassl:cyassl:0.5.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.42%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0242 is in the 72nd percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2013-1623Moderate

yaSSL: TLS CBC padding timing attack

Feb 4, 2013

References

openwall.com / lists/oss-security/2013/02/05/24
secunia.com / advisories/53372
security.gentoo.org / glsa/glsa-201308-06.xml
isg.rhul.ac.uk / tls/TLStiming.pdf
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