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Vulnerability record · CVE-2013-1762 · published 8 March 2013

CVE-2013-1762: Stunnel code injection vulnerability

Stunnel · Stunnel

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

6.6 CVSS 2.0 Medium EPSS 2.9% · top 13.4% CWE-94 · Code injection
6.6CVSS 2.0 base score
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
16 Jun 2026Last modified by NVD

Description

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

AV:N/AC:H/Au:N/C:P/I:P/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://rhn.redhat.com/errata/RHSA-2013-0714.html
http://www.debian.org/security/2013/dsa-2664
http://www.mandriva.com/security/advisories?name=MDVSA-2013:130
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097
https://www.stunnel.org/CVE-2013-1762.html Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2013-0714.html
http://www.debian.org/security/2013/dsa-2664
http://www.mandriva.com/security/advisories?name=MDVSA-2013:130
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097
https://www.stunnel.org/CVE-2013-1762.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2001-0060Stunnel vulnerabilityFormat string vulnerability in stunnel 3.8 and earlier allows attackers to execute arbitrary commands via a malformed ident username.EPSS 2.8%9.3CVE-2011-2940Stunnel memory buffer overflow vulnerabilitystunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified ve…EPSS 5.7%7.5CVE-2021-20230Stunnel improper certificate validation vulnerabilityA flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain…EPSS 1.2%7.5CVE-2002-0002Stunnel vulnerabilityFormat string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp, (2) pop, or (3) nntp allows remote malicious servers to exe…EPSS 5.3%7.2CVE-2008-2400Stunnel permissions and access controls vulnerabilityUnspecified vulnerability in stunnel before 4.23, when running as a service on Windows, allows local users to gain privileges via unknown attack vect…EPSS 0.35%6.8CVE-2008-2420Stunnel permissions and access controls vulnerabilityThe OCSP functionality in stunnel before 4.24 does not properly search certificate revocation lists (CRL), which allows remote attackers to bypass in…EPSS 1.4%5.8CVE-2015-3644Stunnel improper access control vulnerabilityStunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial connection, …EPSS 2.1%5.0CVE-2003-0147Openpkg vulnerabilityOpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's private key by determining factors using…EPSS 6.4%

Source: NIST National Vulnerability Database (record CVE-2013-1762), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.