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Servers and applications

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.

Severity
Low 2.6
Published
18 Nov 2013
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.8% in the next 30 daysHigher than 86% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Information exposure (CWE-200)
Attack
Over the network · Only under certain conditions · No login needed
Attacker can
Read some data
CVSS vector
AV:N/AC:H/Au:N/C:P/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Version 2.2.0
  • Version 2.1.0
  • Version 1.6.0
  • Version 1.5.0
All 14 release lines
  • Every version up to 2.3.0
  • Version 1.2.0
  • Version 1.2.1
  • Version 1.3.0
  • Version 1.3.1
  • Version 1.3.2
  • Version 1.4.0
  • Version 1.4.1
  • Version 1.4.2
  • Version 1.4.3
  • Version 1.5.0
  • Version 1.6.0
  • Version 2.1.0
  • Version 2.2.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2013-2061
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2013-2061