What is CVE-2021-26109?

CVE-2021-26109 is a high-severity vulnerability in Fortinet Fortios, classified under Integer Overflow or Wraparound. CVSS score: 8.1/10. Published 2021-12-08.

How severe is CVE-2021-26109?

High severity. CVSS v3 base score is 8.1 out of 10.

Integer overflow in Fortinet Fortios

CVE-2021-26109

An integer overflow or wraparound vulnerability in the memory allocator of SSLVPN in FortiOS before 7.0.1 may allow an unauthenticated attacker to corrupt control data on the heap via specifically crafted requests to SSLVPN, resulting in p…

Vulnerability class: Integer Overflow

EPSS: 0.018 (76.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fortinet Fortios — versions FortiOS before 7.0.1
Fortinet Fortios — versions 7.0.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

psirt@fortinet.com (x_refsource_CONFIRM, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26109?: CVE-2021-26109 is a high-severity vulnerability in Fortinet Fortios, classified under Integer Overflow or Wraparound. CVSS score: 8.1/10. Published 2021-12-08.
How severe is CVE-2021-26109?: High severity. CVSS v3 base score is 8.1 out of 10.