CVE-2013-4545

mediumpriority · track · 18EPSS 0.030 · 87 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.97% (87th) EPSS

CVSS 4.3 · medium

Is it mine?

73 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.7–4.3

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v2.03.7lowAV:N/AC:M/Au:N/C:N/I:P/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-310USprimary

affected products (73)

Products and version ranges known to be affected.

Debian Linux Squeeze (6.0)all versionscert_bundDEcpe:/o:debian:debian_linux:6.0
Debian Linux Wheezy (7.0)all versionscert_bundDEcpe:/o:debian:debian_linux:7.0
Dell NetWorker < 19.9.0.1all versionscert_bundDEcpe:/a:dell:networker:19.9.0.1
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
n/a n/a≤ n/aenisa_euvdEU
haxx curl= 7.18.0nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.18.1nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.18.2nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.0nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.1nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.2nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.3nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.4nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.5nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.6nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.19.7nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.20.0nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.20.1nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.21.0nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
haxx curl= 7.21.1nvdUScpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

showing 20 of 73

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-1656cURL: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2013-11-17csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in cURL ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
CURL-CVE-2013-4545cert name check ignore OpenSSL2013-11-15vendor · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2013-11-23modified 2026-06-16

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+2915 more

references (20)

External citations — patches, advisories, analysis.

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