CVE-2013-2061
The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode,...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2013-2061- CVSS 2.0
- 2.6 Low
AV:N/AC:H/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2013-2061- Updated
- 2026-11-02
EUVDEUVD-2013-2042 No score
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.
- Record
EUVD-2013-2042- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j3mr-328w-64j3 No score
The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode,...
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.
- Record
GHSA-j3mr-328w-64j3- Weakness
- CWE-200
- Updated
- 2026-11-02
OSV No score
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.
- Record
CVE-2013-2061- Updated
- 2026-11-02
OSVDEBIAN-CVE-2013-2061 No score
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.
- Record
DEBIAN-CVE-2013-2061- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2013-2061 is a low vulnerability (CVSS 2.6) in Openvpn, published November 15, 2013. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.81%, the 86th percentile. Fixed in openvpn 2.3.1-1.
References
lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html
lists.opensuse.org/opensuse-updates/2013-11/msg00012.html
bugzilla.redhat.com/show_bug.cgi?id=960192
openwall.com/lists/oss-security/2013/05/06/6
mandriva.com/security/advisories?name=MDVSA-2013:167
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bugs.gentoo.org/show_bug.cgi?id=468756
github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee
community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc
nvd.nist.gov/vuln/detail/CVE-2013-2061
security-tracker.debian.org/tracker/CVE-2013-2061