Full Report
Check Point security advisory (AV26-933)
Analysis Summary
# Vulnerability: Stack Overflow in Check Point Security Management and Log Servers
## CVE Details
- **CVE ID:** CVE-2026-91843
- **CVSS Score:** 9.8 (Critical) *(Estimated based on standard metrics for unauthenticated remote code execution via stack overflow)*
- **CWE:** CWE-121 (Stack-based Buffer Overflow)
## Affected Systems
- **Products:** Security Management Server, Multi-Domain Security Management Server, Log Server, and Multi-Domain Log Server.
- **Versions:**
- R81.20: Jumbo Hotfix Take 166 and prior
- R82: Jumbo Hotfix Take 126 and prior
- R82.10: Jumbo Hotfix Take 44 and prior
- R82.20: All versions prior to the released fix
- **Configurations:** Systems running the login process for management and logging services.
## Vulnerability Description
A stack-based buffer overflow vulnerability exists in the login process of several Check Point management and log server products. The flaw occurs when the service fails to properly validate the length of input data before copying it to a fixed-size stack buffer during the authentication phase. A remote, unauthenticated attacker could exploit this to overwrite memory and potentially execute arbitrary code with elevated privileges.
## Exploitation
- **Status:** Not explicitly reported as exploited in the wild at the time of advisory (Pending active monitoring).
- **Complexity:** Low
- **Attack Vector:** Network
## Impact
- **Confidentiality:** High (Full access to management data)
- **Integrity:** High (Potential for full system takeover)
- **Availability:** High (Potential for service crashes or permanent system lockout)
## Remediation
### Patches
Check Point recommends updating to the following Jumbo Hotfix Takes or higher:
- **R81.20:** Apply Jumbo Hotfix Take 167 or later.
- **R82:** Apply Jumbo Hotfix Take 127 or later.
- **R82.10:** Apply Jumbo Hotfix Take 45 or later.
- **R82.20:** Refer to the latest maintenance release via Check Point Support.
### Workarounds
- Restrict access to the Security Management and Log Server interfaces to trusted internal IP addresses only (using Firewall rules/ACLs).
- Disable unnecessary management interfaces on public-facing networks.
## Detection
- **Indicators of Compromise:** Monitor for unexpected crashes of the `cpd` or `fwm` processes. Look for unusual source IPs attempting repetitive high-volume login requests.
- **Detection methods and tools:** Check `top` or `ps` for service restarts. Review management logs for failed authentication attempts with unusually long character strings.
## References
- Check Point Support (sk1000155): hxxps[://]support[.]checkpoint[.]com/results/sk/sk1000155
- Check Point Security Blog: hxxps[://]blog[.]checkpoint[.]com/security/
- Canadian Centre for Cyber Security (AV26-933): hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/check-point-security-advisory-av26-933