How severe is CVE-2021-24015?

CVE-2021-24015 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24015 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24015?

CVE-2021-24015 affects Fortinet Fortimail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24015?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-24015 published?

CVE-2021-24015 was published on 2021-07-12 and last updated on 2026-06-17.

CVE-2021-24015

CVE-2021-24015 is a high-severity vulnerability in Fortinet Fortimail with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Fortinet Fortimail
Published: 2021-07-12
Last modified: 2026-06-17

Description

An improper neutralization of special elements used in an OS Command vulnerability in the administrative interface of FortiMail before 6.4.4 may allow an authenticated attacker to execute unauthorized commands via specifically crafted HTTP requests.

Frequently asked questions

What is CVE-2021-24015?: An improper neutralization of special elements used in an OS Command vulnerability in the administrative interface of FortiMail before 6.4.4 may allow an authenticated attacker to execute unauthorized commands via specifically crafted HTTP requests.
How severe is CVE-2021-24015?: CVE-2021-24015 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24015 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24015?: CVE-2021-24015 affects Fortinet Fortimail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24015?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-24015 published?: CVE-2021-24015 was published on 2021-07-12 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-21-021

Affected products (1)

cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*

More vulnerabilities in Fortinet Fortimail

CVE-2025-32756 — Critical (CVSS 9.8): A stack-based buffer overflow vulnerability [CWE-121] vulnerability in Fortinet FortiCamera 2.1.0 through 2.1.3,…
CVE-2023-47539 — Critical (CVSS 9.8): An improper access control vulnerability in FortiMail version 7.4.0 configured with RADIUS authentication and…
CVE-2021-36166 — Critical (CVSS 9.8): An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote attacker to efficiently guess one…
CVE-2021-24007 — Critical (CVSS 9.8): Multiple improper neutralization of special elements of SQL commands vulnerabilities in FortiMail before 6.4.4 may…
CVE-2020-9294 — Critical (CVSS 9.8): An improper authentication vulnerability in FortiMail 5.4.10, 6.0.7, 6.2.2 and earlier and FortiVoiceEntreprise 6.0.0…
CVE-2023-36556 — High (CVSS 8.8): An incorrect authorization vulnerability [CWE-863] in FortiMail webmail version 7.2.0 through 7.2.2, version 7.0.0…

All CVEs affecting Fortinet Fortimail →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-56004 — Critical (CVSS 10.0): A shellcode injection in the mercurial handler of the obs tar_scm source service before version 0.12.4 could be used by…
CVE-2026-56415 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability within the debug.pl script that is…
CVE-2026-56413 — Critical (CVSS 10.0): Storage Concentrator (SC & SCVM) contains a command injection vulnerability in the ms_service.pl service, which listens…
CVE-2026-49869 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in…
CVE-2026-49261 — Critical (CVSS 10.0): MariaDB server is a community developed fork of MySQL server. Versions 10.6.1 through 10.6.26, 10.11.1 through…
CVE-2026-10520 — Critical (CVSS 10.0): An OS Command Injection vulnerability in Ivanti Sentry before the R10.5.2, R10.6.2 and R10.7.1 versions allows a…

Browse all CWE-78 (OS Command Injection) vulnerabilities →