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Fencer Vulns
high 8.7

CVE-2026-84732 json

Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to cause a denial of service vi…

published 2026-09-07 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-72302

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to cause a denial of service via crafted inputs that trigger a timeout integer overflow

Patch / fix

  • openvpn openvpn 2.6.23, 2.7.7
  • openvpn Debian 14 2.7.7-1

debian advisories DEBIAN-CVE-2026-84732

  • openvpn Ubuntu 22.04 LTS 2.5.11-0ubuntu0.22.04.5
  • openvpn Ubuntu 24.04 LTS 2.6.19-0ubuntu0.24.04.4
  • openvpn Ubuntu 26.04 LTS 2.7.0-1ubuntu1.3

ubuntu advisories UBUNTU-CVE-2026-84732

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openvpn SLES for SAP applications 16.0, SLES 16.0 2.6.10-160000.5.1
  • openvpn SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.5.6-150400.3.28.1
  • openvpn SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.6.10-150600.3.37.1
  • openvpn-dco SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.6.10-150600.3.37.1
  • openvpn SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.3.8-16.38.1

suse advisories SUSE-SU-2026:24220-1SUSE-SU-2026:4242-1SUSE-SU-2026:4217-1SUSE-SU-2026:4213-1

  • openvpn openSUSE Leap 16.0 2.6.10-160000.5.1

opensuse advisories openSUSE-SU-2026:22072-1

  • openvpn Alpine 3.24 2.7.7-r0

alpine advisories ALPINE-CVE-2026-84732

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-84732 updated cvss 7.5

openvpn: OpenVPN: Remote Denial of Service via crafted ACK packets

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • OpenVPN OpenVPN

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.