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Vulnerability record · CVE-2013-2061 · published 18 November 2013

CVE-2013-2061: Openvpn information exposure vulnerability

Openvpn · Openvpn

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.

2.6 CVSS 2.0 Low EPSS 2.8% · top 14.0% CWE-200 · Information exposure
2.6CVSS 2.0 base score
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
20References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

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

References

LinkTags
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:167
http://www.openwall.com/lists/oss-security/2013/05/06/6
https://bugs.gentoo.org/show_bug.cgi?id=468756
https://bugzilla.redhat.com/show_bug.cgi?id=960192
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc
https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee ExploitPatch
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html
http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:167
http://www.openwall.com/lists/oss-security/2013/05/06/6
https://bugs.gentoo.org/show_bug.cgi?id=468756
https://bugzilla.redhat.com/show_bug.cgi?id=960192
https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc
https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee ExploitPatch

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Source: NIST National Vulnerability Database (record CVE-2013-2061), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.