Vulnerability Monitor

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CVE-2013-2061

The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher.

Security Impact Summary

CVE-2013-2061 is a security vulnerability that . Impacting 3 products from openvpn, from openvpn, from opensuse organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2013, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2013-11-18T02:55:07.530

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 2.6 (LOW)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: HIGH
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

4.9

Impact Score

2.9

Weaknesses

Type: Primary
CWE-200

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openvpn	openvpn	≤ 2.3.0	Yes
Application	openvpn	openvpn	1.2.0	Yes
Application	openvpn	openvpn	1.2.1	Yes
Application	openvpn	openvpn	1.3.0	Yes
Application	openvpn	openvpn	1.3.1	Yes
Application	openvpn	openvpn	1.3.2	Yes
Application	openvpn	openvpn	1.4.0	Yes
Application	openvpn	openvpn	1.4.1	Yes
Application	openvpn	openvpn	1.4.2	Yes
Application	openvpn	openvpn	1.4.3	Yes
Application	openvpn	openvpn	1.5.0	Yes
Application	openvpn	openvpn	1.6.0	Yes
Application	openvpn	openvpn	2.1.0	Yes
Application	openvpn	openvpn	2.2.0	Yes
Application	openvpn	openvpn_access_server	2.0.0	Yes
Operating System	opensuse	opensuse	11.4	Yes

References

http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html Vendor Advisory ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html ([email protected])
http://www.mandriva.com/security/advisories?name=MDVSA-2013:167 ([email protected])
http://www.openwall.com/lists/oss-security/2013/05/06/6 ([email protected])
https://bugs.gentoo.org/show_bug.cgi?id=468756 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=960192 ([email protected])
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc ([email protected])
https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee Exploit, Patch ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.mandriva.com/security/advisories?name=MDVSA-2013:167 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2013/05/06/6 (af854a3a-2127-422b-91ae-364da2661108)
https://bugs.gentoo.org/show_bug.cgi?id=468756 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=960192 (af854a3a-2127-422b-91ae-364da2661108)
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee Exploit, Patch (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openvpn's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.