CVE-2026-50752
Certificate Validation Bypass in VPN Site-to-Site Connections Using IKEv1
No known exploitation. EPSS puts it in the 16th percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
A weakness in the certificate validation logic of the deprecated IKEv1 key exchange may allow an unauthenticated attacker positioned as a man-in-the-middle to bypass certificate validation in VPN site-to-site connections that use certificate-based authentication. Successful exploitation could allow interception or modification of traffic traversing the VPN tunnel.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.3% chance of exploitation activity in the next 30 days, which ranks it in the 16th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
9 events over 46 days, from the signal feeds we watch.
- Analysis publishedCheck Point VPN: the IKEv1 flaw that lets attackers log in with no password (CVE-2026-50751)
- Patch availablerecord updated
- OpenVAS check added
- Patch availablepublished, weakness classified, att&ck mapped, record updated
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Scored 7.4 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- support.checkpoint.com/results/sk/sk185035
- xakep.ru/2026/06/09/check-point-0day/&
- securitylab.ru/news/573575.php&
And 1 more reference. See all after sign-in
In the news
- IT threat evolution in Q2 2026. Non-mobile statistics
- Вымогатели больше месяца пользовались 0-day-уязвимостью в Check Point VPN
- Check Point VPN Zero-Day Exploited in Qilin Ransomware Attacks
- Check Point VPN Flaw Exploited Since Early May
- Critical Check Point VPN Zero-Day Exploited in the Wild (CVE-2026-50751)
- Critical Check Point VPN Flaw Exploited to Bypass Passwords in IKEv1 Setups
- Check Point links VPN zero-day attacks to Qilin ransomware gang
- Check Point VPN Vulnerability Exploited in the Wild with Ransomware Links
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