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CVE-2005-3409· NVD / CVE Program· CNA mitre

OpenVPN 2.x before 2.0.4, when running in TCP mode, allows remote attackers to cause a denial of service (segmentation fault) by forcing the

OpenVPN 2.x before 2.0.4, when running in TCP mode, allows remote attackers to cause a denial of service (segmentation fault) by forcing the accept function call to return an error status, which leads to a null dereference in an exception handler.

MediumCVSS 5.0 · v2.0—No exploit Fix available
Published
Nov 1, 2005
Updated
Jun 16, 2026
EPSS
2.5% · 84th percentile
CWE
—
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.5%

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

VendorProduct
openvpnopenvpn
openvpnopenvpn access server

Affected versions

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

  • openvpn openvpn2.0
  • openvpn openvpn2.0_beta1
  • openvpn openvpn2.0_beta10
  • openvpn openvpn2.0_beta11
  • openvpn openvpn2.0_beta12
  • openvpn openvpn2.0_beta13
  • openvpn openvpn2.0_beta15
  • openvpn openvpn2.0_beta16
  • openvpn openvpn2.0_beta17
  • openvpn openvpn2.0_beta18
  • openvpn openvpn2.0_beta19
  • openvpn openvpn2.0_beta2
  • openvpn openvpn2.0_beta20
  • openvpn openvpn2.0_beta28
  • openvpn openvpn2.0_beta3
  • openvpn openvpn2.0_beta4
  • openvpn openvpn2.0_beta5
  • openvpn openvpn2.0_beta6
  • openvpn openvpn2.0_beta7
  • openvpn openvpn2.0_beta8

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12openvpnbefore 2.0.5-12.0.5-1
Debian:3.1openvpnbefore 2.0-1sarge22.0-1sarge2
openSUSE:Tumbleweedopenvpnbefore 2.5.3-1.22.5.3-1.2

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 / packageFixed versionSource
debian:openvpn2.0.5-1 · Debian:12Package registry (OSV)
opensuse:openvpn2.5.3-1.2 · openSUSE:TumbleweedPackage 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

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
None
Integrity impact
None
Availability impact
P

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

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

All records