CVE-2013-4545
cURL and libcurl 7.18.0 through 7.32.0, when built with OpenSSL, disables the certificate CN and...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2013-4545- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-310
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2013-4545- Updated
- 2026-11-02
EUVDEUVD-2013-4404 No score
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.
- Record
EUVD-2013-4404- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-94rh-gwj6-33j3 No score
cURL and libcurl 7.18.0 through 7.32.0, when built with OpenSSL, disables the certificate CN and...
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.
- Record
GHSA-94rh-gwj6-33j3- Updated
- 2026-11-02
OSVCURL-CVE-2013-4545 No score
cert name check ignore OpenSSL
libcurl is vulnerable to a case of missing out the checking of the certificate CN or SAN name field when the digital signature verification is turned off.
libcurl offers two separate and independent options for verifying a server's
TLS certificate. CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST. The
first one tells libcurl to verify the trust chain using a CA cert bundle,
while the second tells libcurl to make sure that the name fields in the
server certificate meets the criteria. Both options are enabled by default.
This flaw had the effect that when an application disabled
CURLOPT_SSL_VERIFYPEER, libcurl mistakenly also disabled the
CURLOPT_SSL_VERIFYHOST check. Applications can disable
CURLOPT_SSL_VERIFYPEER and still achieve security by doing the check on
its own using other means.
The curl command line tool is not affected by this problem as it either enables both options or disables both at the same time.
- Record
CURL-CVE-2013-4545- Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2013-4545- Updated
- 2026-11-02
Show 4 moreShow less
OSVDEBIAN-CVE-2013-4545 No score
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.
- Record
DEBIAN-CVE-2013-4545- Updated
- 2026-11-02
OSVMGASA-2013-0338 No score
Updated curl packages fix CVE-2013-4545
Updated curl packages fix security vulnerability:
Scott Cantor discovered that curl, a file retrieval tool, would disable the CURLOPT_SSLVERIFYHOST check when the CURLOPT_SSL_VERIFYPEER setting was disabled. This would also disable ssl certificate host name checks when it should have only disabled verification of the certificate trust chain (CVE-2013-4545).
- Record
MGASA-2013-0338- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10303-1 No score
curl-7.51.0-1.1 on GA media
These are all security issues fixed in the curl-7.51.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10303-1- Updated
- 2026-11-02
OSVSUSE-SU-2015:0962-1 No score
Security update for curl
This curl update fixes the following security issues:
* bnc#868627: wrong re-use of connections (CVE-2014-0138).
* bnc#868629: IP address wildcard certificate validation
(CVE-2014-0139).
* bnc#870444: --insecure option inappropriately enforcing security
safeguard.
Security Issue references:
* CVE-2014-0138
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0138>
* CVE-2014-0139
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0139>
- Record
SUSE-SU-2015:0962-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
curlDebian:12 |
before 7.33.0-1 | 7.33.0-1 |
curlDebian:13 |
before 7.33.0-1 | 7.33.0-1 |
curlDebian:14 |
before 7.33.0-1 | 7.33.0-1 |
curlDebian:6.0 |
before 7.21.0-2.1+squeeze5, plus listed versions 7.21.0-17.21.0-27.21.0-2.1+squeeze17.21.0-2.1+squeeze27.21.0-2.1+squeeze37.21.0-2.1+squeeze4 |
7.21.0-2.1+squeeze5 |
curlDebian:7 |
before 7.26.0-1+wheezy5, plus listed versions 7.26.0-1+wheezy27.26.0-1+wheezy37.26.0-1+wheezy4 |
7.26.0-1+wheezy5 |
curlMageia:2 |
before 7.24.0-1.3.mga2 | 7.24.0-1.3.mga2 |
curlMageia:3 |
before 7.28.1-6.2.mga3 | 7.28.1-6.2.mga3 |
curlopenSUSE:Tumbleweed From an advisory covering 32 CVEs |
before 7.51.0-1.1 | 7.51.0-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2013-4545 is a medium vulnerability (CVSS 4.3) in Haxx Curl, published November 15, 2013. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.97%, the 87th percentile. Fixed in curl 7.33.0-1.
References
oracle.com/technetwork/topics/security/cpujul2015-2367936.html
h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04463322
curl.haxx.se/docs/adv_20131115.html
debian.org/security/2013/dsa-2798
Show 51 moreShow less
lists.opensuse.org/opensuse-updates/2013-12/msg00047.html
ubuntu.com/usn/USN-2048-1
nvd.nist.gov/vuln/detail/CVE-2013-4545
github.com/advisories/GHSA-94rh-gwj6-33j3
security-tracker.debian.org/tracker/CVE-2013-4545
advisories.mageia.org/MGASA-2013-0338.html
bugs.mageia.org/show_bug.cgi?id=11703
suse.com/support/update/announcement/2015/suse-su-20150962-1
bugzilla.suse.com/824517