CVE-2014-3511

CVE-2014-3511 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

The ssl23_get_client_hello function in s23_srvr.c in OpenSSL 1.0.1 before 1.0.1i allows man-in-the-middle attackers to force the use of TLS 1.0 by triggering ClientHello message fragmentation in communication between a client and server that both support later TLS versions, related to a "protocol downgrade" issue.

Frequently asked questions

What is CVE-2014-3511?
The ssl23_get_client_hello function in s23_srvr.c in OpenSSL 1.0.1 before 1.0.1i allows man-in-the-middle attackers to force the use of TLS 1.0 by triggering ClientHello message fragmentation in communication between a client and server that both support later TLS versions, related to a "protocol downgrade" issue.
How severe is CVE-2014-3511?
CVE-2014-3511 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2014-3511 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-3511?
CVE-2014-3511 primarily affects Openssl. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-3511?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-3511 published?
CVE-2014-3511 was published on 2014-08-13 and last updated on 2026-06-17.

References

Affected products (31)

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Threat intelligence

Threat-intel indicators referencing this CVE: