CVE-2026-50751: Check Point Security Gateway Improper Authentication Vulnerability

In short

Check Point Security Gateway has a weakness classified as improper authentication (CWE-287). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-06-08. CISA reports known ransomware campaign use.

What it is

“Check Point Security Gateway contains an improper authentication vulnerability in IKEv1 key exchange that could allow an unauthenticated remote attacker to bypass user authentication and establish a remote access VPN connection without a valid user password.” — CISA KEV, retrieved 2026-11-01

“A logic flow weakness in Remote Access and Mobile Access certificate validation in deprecated IKEv1 key exchange allows an unauthenticated remote attacker to bypass user authentication and establish a remote access VPN connection without a valid user password.” — NVD, retrieved 2026-11-01

Who is affected

Check Point Security Gateway. NVD lists the following versions as affected:

• Checkpoint Gaia OS: from r80.40 inclusive, before r81.20
• Checkpoint Gaia OS: version r81.20
• Checkpoint Gaia OS: version r82
• Checkpoint Gaia OS: version r82.10
• Checkpoint Gaia Embedded: from r80.20.00 inclusive, before r81.10.17
• Checkpoint Gaia Embedded: version r81.10.17
• Checkpoint Gaia Embedded: from r80.20.00 inclusive, before r82.00.10
• Checkpoint Gaia Embedded: version r82.00.10

Exploitation status

CISA KEV added: 2026-06-08. Known ransomware campaign use: Known (reported by CISA). Due date CISA set for US federal civilian agencies: 2026-06-11.

Scores

CVSS: Not listed by NVD.

EPSS by FIRST: 85.34%; percentile 99.72; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-287.

Timeline

CISA required action

“Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.” — CISA KEV

What to do

• Confirm whether you run Check Point Security Gateway and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Mitigation, Patch, Vendor Advisory: https://support.checkpoint.com/results/sk/sk185033
• Vendor Advisory: https://blog.checkpoint.com/security/check-point-releases-important-hotfix-for-vulnerabilities-in-deprecated-ikev1-vpn-protocol/
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.