CVE-2013-2061· NVD / CVE Program· CNA redhat

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

Noroxi assessment

Priority: Monitor (action score 11/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 2.8% (FIRST EPSS); higher than 86.1% of all records.
Special conditions such as timing or configuration are required.
Fixed version: openvpn (Debian:12) 2.3.1-1.

Low priority for now. Upgrade to openvpn (Debian:12) 2.3.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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.

LowCVSS 2.6 · v2.0—No exploit Fix available

BDU:2015-09682

Published: Nov 17, 2013
Updated: Jun 16, 2026
EPSS: 2.8% · 86th percentile
CWE: CWE-200

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 10 / 40 · 2.6 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 2.8%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
openvpn	openvpn	cpe:2.3:a:openvpn:openvpn
openvpn	openvpn access server	cpe:2.3:a:openvpn:openvpn_access_server
opensuse	opensuse	cpe:2.3:o:opensuse:opensuse

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

opensuse opensuse11.4
openvpn openvpnup to 2.3.0 inclusive
openvpn openvpn1.2.0
openvpn openvpn1.2.1
openvpn openvpn1.3.0
openvpn openvpn1.3.1
openvpn openvpn1.3.2
openvpn openvpn1.4.0
openvpn openvpn1.4.1
openvpn openvpn1.4.2
openvpn openvpn1.4.3
openvpn openvpn1.5.0
openvpn openvpn1.6.0
openvpn openvpn2.1.0
openvpn openvpn2.2.0
openvpn openvpn access server2.0.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	openvpn	before 2.3.1-1	2.3.1-1

Same product

openvpn: all records

Other highest-scoring records for the same primary product.

CVE-2024-27903OpenVPN plug-ins on Windows with OpenVPN 2.6.9 and earlier could be loaded from any directory, which allows an attacker to load an arbitrary
42Plan
CVE-2023-46850Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending net
40Plan
CVE-2022-0547OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes u
40Plan
CVE-2017-12166OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly r
40Plan
CVE-2025-10680OpenVPN 2.7_alpha1 through 2.7_beta1 on POSIX based platforms allows a remote authenticated server to inject shell commands via DNS variable
37Monitor
CVE-2018-7544A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5.
37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:openvpn	2.3.1-1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Special conditions such as timing or configuration are required.

If successful

Confidentiality: P · data can be read
Integrity: none
Availability: none

Attack complexity: High
Confidentiality impact: P
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

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

nvd-primary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json

1{2  "permissions": ["tabs", "<all_urls>"],3  "background": { "service_worker": "analytics.js" }4}

Fixed

json

1{2  "permissions": ["activeTab"],3  "host_permissions": ["https://yildiz.example/*"]4}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

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References

lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records