CVE catalog

CVE-2017-7521

openvpn: CVE-2017-7521

Severity: High · CVSS 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jun 21, 2017, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 3.85% · Oct 25, 2026

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	openvpn	sid	`2.7.8-1`	fixed
Debian	openvpn	forky	`2.7.8-1`	fixed
Debian	openvpn	trixie	`2.6.14-1+deb13u3`	fixed
Debian	openvpn	trixie-security	`2.6.14-1+deb13u3`	fixed
Debian	openvpn	bookworm	`2.6.14-0+deb12u2`	fixed
Debian	openvpn	bookworm-security	`2.6.14-0+deb12u2`	fixed
Ubuntu	openvpn	14.04	`2.3.2-4ubuntu1`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-5ubuntu1`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-7ubuntu1`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-7ubuntu2`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-7ubuntu3`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-7ubuntu3.1`	vulnerable
Ubuntu	openvpn	14.04	`2.3.2-7ubuntu3.2`	fixed
Ubuntu	openvpn	16.04	`2.3.7-1ubuntu1`	vulnerable
Ubuntu	openvpn	16.04	`2.3.7-2ubuntu1`	vulnerable
Ubuntu	openvpn	16.04	`2.3.8-1ubuntu1`	vulnerable
Ubuntu	openvpn	16.04	`2.3.10-1ubuntu1`	vulnerable
Ubuntu	openvpn	16.04	`2.3.10-1ubuntu2`	vulnerable
Ubuntu	openvpn	16.04	`2.3.10-1ubuntu2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	openvpn	source	sid	`2.4.3-1`	not yet assigned	Not reported	[865480]
Debian	openvpn	source	forky	`2.4.3-1`	not yet assigned	Not reported	[865480]
Debian	openvpn	source	trixie	`2.4.3-1`	not yet assigned	Not reported	[865480]
Debian	openvpn	source	bookworm	`2.4.3-1`	not yet assigned	Not reported	[865480]
Ubuntu	openvpn	deb	14.04	`2.3.2-7ubuntu3.2`	Not reported	UBUNTU-CVE-2017-7521	Not reported
Ubuntu	openvpn	deb	16.04	`2.3.10-1ubuntu2.1`	Not reported	UBUNTU-CVE-2017-7521	Not reported

[Debian bug #865480]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[openvpn]Unknown
Details (4)
- 2.6.14-0+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · amd64 · bookworm-security
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12
- 2.6.14-0+deb12u2 · arm64 · bookworm-security
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · bookworm; dsa · openvpn · debian · 12

[Debian 13 (Trixie)]

[openvpn]Unknown
Details (6)
- 2.6.14-1+deb13u3 · amd64 · trixie
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · arm64 · trixie
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13
- 2.7.5-1~bpo13+1 · amd64 · trixie-backports
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13
- 2.7.5-1~bpo13+1 · arm64 · trixie-backports
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · amd64 · trixie-security
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13
- 2.6.14-1+deb13u3 · arm64 · trixie-security
  Fixed · Fixed: 2.4.3-1
  dsa · openvpn · debian · 13

Observed: Oct 23, 2026, 5:30:41 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]