CVE-2021-26115: An OS command injection (CWE-78) vulnerability in FortiWAN version 4.5.7 and below Command Line Interface may

Q: How do I fix CVE-2021-26115?

fortiwan: upgrade to 4.5.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-26115 being exploited?

CVE-2021-26115 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-26115 affect?

CVE-2021-26115 affects fortiwan. Severity is high (CVSS 7.8). An OS command injection (CWE-78) vulnerability in FortiWAN version 4.5.7 and below Command Line Interface may allow a local, authenticated and unprivileged attacker to escalate their privileges to root via executing a specially-crafted comm

This month

HIGH 7.8UPGRADE

CVE-2021-26115 is a high-severity flaw (CVSS 7.8) affecting fortiwan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An OS command injection (CWE-78) vulnerability in FortiWAN version 4.5.7 and below Command Line Interface may allow a local, authenticated and unprivileged attacker to escalate their privileges to root via executing a specially-crafted command.An OS command injection (CWE-78) vulnerability in FortiWAN Command Line Interface may allow a local, authenticated and unprivileged attacker to escalate their privileges to root via executing a specially-cr

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-78
Published	2024-12-19
Last modified	2026-06-17

Publisher (CNA): Fortinet, Inc. · Vendor: fortinet

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-19 11:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

fortinet fortiwan UPGRADE

Affected: < 4.5.8

Fixed in: 4.5.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fortiwan || rpm -q fortiwan || fortiwan --version

2. UPGRADE to 4.5.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fortiwan

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fortiwan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-26115?

fortiwan: upgrade to 4.5.8. Exact commands for each OS are on this page.

Is CVE-2021-26115 being exploited?

CVE-2021-26115 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-26115 affect?

CVE-2021-26115 affects fortiwan. Severity is high (CVSS 7.8). An OS command injection (CWE-78) vulnerability in FortiWAN version 4.5.7 and below Command Line Interface may allow a local, authenticated and unprivileged attacker to escalate their privileges to root via executing a specially-crafted comm

How urgent is CVE-2021-26115?

Priority 41/100. High severity

Software pages

Fortinet vulnerabilities

Related CVEs

CVE-2021-26102 CRITICAL 9.8 UPGRADE A relative path traversal vulnerability (CWE-23) in FortiWAN version 4.5.7 and below, 4.4 all versions may all

References

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