CVE-2009-2417

CVE-2009-2417 is a high-severity vulnerability in Curl Libcurl with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

• Severity: High (CVSS 2.0 base score 7.5)
• EPSS exploit prediction: 4% (88th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-310
• Affected product: Curl Libcurl
• Published: 2009-08-14
• Last modified: 2026-06-16

Description

lib/ssluse.c in cURL and libcurl 7.4 through 7.19.5, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Frequently asked questions

What is CVE-2009-2417?

lib/ssluse.c in cURL and libcurl 7.4 through 7.19.5, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

How severe is CVE-2009-2417?

CVE-2009-2417 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2009-2417 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2417?

CVE-2009-2417 primarily affects Curl Libcurl. In total, 74 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2417?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-2417 published?

CVE-2009-2417 was published on 2009-08-14 and last updated on 2026-06-16.

References

• http://curl.haxx.se/CVE-2009-2417/curl-7.10.6-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.11.0-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.12.1-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.15.1-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.15.5-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.16.4-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.18.1-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.19.0-CVE-2009-2417.patch
• http://curl.haxx.se/CVE-2009-2417/curl-7.19.5-CVE-2009-2417.patch
• http://curl.haxx.se/docs/adv_20090812.txt
• http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html
• http://secunia.com/advisories/36238
• http://secunia.com/advisories/36475
• http://secunia.com/advisories/37471
• http://secunia.com/advisories/45047
• http://shibboleth.internet2.edu/secadv/secadv_20090817.txt
• http://support.apple.com/kb/HT4077
• http://wiki.rpath.com/Advisories:rPSA-2009-0124
• http://www.securityfocus.com/archive/1/506055/100/0/threaded
• http://www.securityfocus.com/archive/1/507985/100/0/threaded
• http://www.securityfocus.com/bid/36032
• http://www.ubuntu.com/usn/USN-1158-1
• http://www.vmware.com/security/advisories/VMSA-2009-0016.html
• http://www.vupen.com/english/advisories/2009/2263
• http://www.vupen.com/english/advisories/2009/3316
• https://exchange.xforce.ibmcloud.com/vulnerabilities/52405
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10114
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8542

Affected products (74)

• cpe:2.3:a:curl:libcurl:7.4:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.5:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.5.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.5.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.6:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.7:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.7.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.7.3:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.8:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.3:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.5:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.6:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.7:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.9.8:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.3:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.4:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.5:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.6:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.7:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.10.8:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.11.0:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.11.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.11.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.12:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.12.0:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.12.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.12.2:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.12.3:*:*:*:*:*:*:*
• cpe:2.3:a:curl:libcurl:7.13:*:*:*:*:*:*:*

More vulnerabilities in Curl Libcurl

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• CVE-2013-6952 — Critical (CVSS 10.0): The Belkin WeMo Home Automation firmware before 3949 has a hardcoded GPG key, which makes it easier for remote…
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• CVE-2013-0137 — Critical (CVSS 10.0): The default configuration of the Digital Alert Systems DASDEC EAS device before 2.0-2 and the Monroe Electronics R189…
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