- Description
- Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client
- Source
- security@openvpn.net
- NVD status
- Analyzed
- Products
- openvpn
CVSS 4.0
- Type
- Secondary
- Base score
- 4.6
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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
- Severity
- MEDIUM
CVSS 3.1
- Type
- Primary
- Base score
- 7.5
- Impact score
- 3.6
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- HIGH
- security@openvpn.net
- CWE-940
- Hype score
- Not currently trending
CVE-2025-13086 Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not ini… https://t.co/ZQeB1kKzoX
@CVEnew
3 Dec 2025
161 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
OpenVPN released an urgent patch fixing two critical flaws: a Heap Over-read (CVE-2025-12106, CVSS 9.1) and an HMAC bypass (CVE-2025-13086) that allows unauthenticated DoS. Windows 7 support is broken. #OpenVPN #Cybersecurity #HMACBypass #PatchNow https://t.co/zKs5gPsu5X
@the_yellow_fall
2 Dec 2025
933 Impressions
7 Retweets
16 Likes
7 Bookmarks
0 Replies
0 Quotes
🔴 CVE-2025-13086: OpenVPN Patches HMAC State Exhaustion Flaw OpenVPN 2.6.16 fixes a bug in memcmp verification during TLS handshake that rendered HMAC-based anti-exhaustion protections ineffective. Attackers can flood spoofed handshake packets to degrade or deny VPN service.
@the_c_protocol
20 Nov 2025
3 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
Urgent #Slackware Security Advisory ⌁ OpenVPN 2.6.16 now available with patch for CVE-2025-13086. Read more: 👉 https://t.co/VUQGqY2Fib #Security https://t.co/Ti3bxJskNJ
@Cezar_H_Linux
20 Nov 2025
35 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*",
"matchCriteriaId": "61429F75-3DE9-499D-B00B-407E476A7B0F",
"versionEndExcluding": "2.6.16",
"versionStartIncluding": "2.6.0",
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},
{
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},
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},
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],
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}
]
}
]