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    CVE-2013-4545

    cURL and libcurl 7.18.0 through 7.32.0, when built with OpenSSL, disables the certificate CN and SAN name field verification (CURLOPT_SSL_VERIFYHOST) when the digital signature verification (CURLOPT_SSL_VERIFYPEER) is disabled, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

    Published:Nov 15, 2013
    Last Modified:Apr 11, 2025
    EPS:Nov 23, 2013
    EPSS Score:0.00666
    CVSS Score:4.3

    Affected Products

    Vendor
    Haxx
    Product
    Curl
    Vendor
    Haxx
    Product
    Libcurl

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-7168 (CVSS 5.3) — Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authenticati…
    CVE-2026-7009 (CVSS 5.3) — When curl is told to use the Certificate Status Request TLS extension, often referred to as *OCSP stapling*, t…
    CVE-2026-6429 (CVSS 5.3) — When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the pa…
    CVE-2026-4873 (CVSS 5.9) — A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection …
    CVE-2026-6253 (CVSS 5.9) — curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the foll…
    CVE-2026-5773 (CVSS 7.5) — libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool …
    CVE-2026-5545 (CVSS 6.5) — libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) reque…
    CVE-2026-6276 (CVSS 7.5) — Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequen…
    CVE-2026-3805 (CVSS 7.5) — When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into al…
    CVE-2026-3784 (CVSS 6.5) — curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request …

    References

    http://curl.haxx.se/docs/adv_20131115.html
    http://lists.opensuse.org/opensuse-updates/2013-12/msg00047.html
    http://lists.opensuse.org/opensuse-updates/2013-12/msg00053.html
    http://www.debian.org/security/2013/dsa-2798
    http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html
    http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
    http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
    http://www.ubuntu.com/usn/USN-2048-1
    https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
    http://curl.haxx.se/docs/adv_20131115.html
    http://lists.opensuse.org/opensuse-updates/2013-12/msg00047.html
    http://lists.opensuse.org/opensuse-updates/2013-12/msg00053.html
    http://www.debian.org/security/2013/dsa-2798
    http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html
    http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
    http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
    http://www.ubuntu.com/usn/USN-2048-1
    https://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High