CVE-2013-2061

Exp

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.

Published: 2013-11-18 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-2061 is rated Exploit Available (51.1/100): CVSS Low severity, with medium exploitation likelihood (EPSS 1.45%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2013-2061

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2013-2061

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 3.40% 1.45% -1.95%
2 2025-03-29 1.45% 3.40% +1.95%
3 2025-03-19 — 1.45% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-2061

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.6 2.0 LOW
AV:N/AC:H/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 4.9 2.9 [email protected]

Weakness enumeration for CVE-2013-2061

OS Trackers for CVE-2013-2061

vendor priority summary link
debian low CVE-2013-2061 low priority: Debian including 1 source packages (openvpn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-2061
gentoo normal CVE-2013-2061: 1 GLSA(s) (201311-13), 1 atom(s) (net-misc/openvpn); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-2061
ubuntu low CVE-2013-2061 low priority: Ubuntu including 1 source packages (openvpn), 9 status rows across 9 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream): ignored 5, not-affected 2, released 2. https://ubuntu.com/security/CVE-2013-2061

Affected software / configurations for CVE-2013-2061

Vendor Product Version Raw CPE
openvpn openvpn <= 2.3.0 cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
openvpn openvpn 1.2.0 cpe:2.3:a:openvpn:openvpn:1.2.0:*:*:*:*:*:*:*
openvpn openvpn 1.2.1 cpe:2.3:a:openvpn:openvpn:1.2.1:*:*:*:*:*:*:*
openvpn openvpn 1.3.0 cpe:2.3:a:openvpn:openvpn:1.3.0:*:*:*:*:*:*:*
openvpn openvpn 1.3.1 cpe:2.3:a:openvpn:openvpn:1.3.1:*:*:*:*:*:*:*
openvpn openvpn 1.3.2 cpe:2.3:a:openvpn:openvpn:1.3.2:*:*:*:*:*:*:*
openvpn openvpn 1.4.0 cpe:2.3:a:openvpn:openvpn:1.4.0:*:*:*:*:*:*:*
openvpn openvpn 1.4.1 cpe:2.3:a:openvpn:openvpn:1.4.1:*:*:*:*:*:*:*
openvpn openvpn 1.4.2 cpe:2.3:a:openvpn:openvpn:1.4.2:*:*:*:*:*:*:*
openvpn openvpn 1.4.3 cpe:2.3:a:openvpn:openvpn:1.4.3:*:*:*:*:*:*:*
openvpn openvpn 1.5.0 cpe:2.3:a:openvpn:openvpn:1.5.0:*:*:*:*:*:*:*
openvpn openvpn 1.6.0 cpe:2.3:a:openvpn:openvpn:1.6.0:*:*:*:*:*:*:*
openvpn openvpn 2.1.0 cpe:2.3:a:openvpn:openvpn:2.1.0:*:*:*:*:*:*:*
openvpn openvpn 2.2.0 cpe:2.3:a:openvpn:openvpn:2.2.0:*:*:*:*:*:*:*
openvpn openvpn_access_server 2.0.0 cpe:2.3:a:openvpn:openvpn_access_server:2.0.0:*:*:*:*:*:*:*
opensuse opensuse 11.4 cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*

References for CVE-2013-2061

cvelogic Threat Intelligence