How severe is CVE-2022-26122?

CVE-2022-26122 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2022-26122 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-26122?

CVE-2022-26122 primarily affects Fortinet Antivirus Engine. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-26122?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-26122 published?

CVE-2022-26122 was published on 2022-11-02 and last updated on 2026-06-17.

CVE-2022-26122

CVE-2022-26122 is a medium-severity vulnerability in Fortinet Antivirus Engine with a CVSS 3.x base score of 4.7. 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-345.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Fortinet Antivirus Engine
Published: 2022-11-02
Last modified: 2026-06-17

Description

An insufficient verification of data authenticity vulnerability [CWE-345] in FortiClient, FortiMail and FortiOS AV engines version 6.2.168 and below and version 6.4.274 and below may allow an attacker to bypass the AV engine via manipulating MIME attachment with junk and pad characters in base64.

Frequently asked questions

What is CVE-2022-26122?: An insufficient verification of data authenticity vulnerability [CWE-345] in FortiClient, FortiMail and FortiOS AV engines version 6.2.168 and below and version 6.4.274 and below may allow an attacker to bypass the AV engine via manipulating MIME attachment with junk and pad characters in base64.
How severe is CVE-2022-26122?: CVE-2022-26122 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2022-26122 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-26122?: CVE-2022-26122 primarily affects Fortinet Antivirus Engine. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-26122?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-26122 published?: CVE-2022-26122 was published on 2022-11-02 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-22-074

Affected products (18)

cpe:2.3:a:fortinet:antivirus_engine:0.4.23:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:2.0.49:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:2.0.60:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:4.4.54:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.33:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.137:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.142:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.144:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.145:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.156:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.157:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.243:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.252:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:antivirus_engine:6.253:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortimail:4.1.0:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.2.0:*:*:*:*:*:*:*

More vulnerabilities in Fortinet Antivirus Engine

CVE-2020-9295 — Medium (CVSS 4.7): FortiOS 6.2 running AV engine version 6.00142 and below, FortiOS 6.4 running AV engine version 6.00144 and below and…

All CVEs affecting Fortinet Antivirus Engine →

Other CWE-345 (Insufficient Verification of Data Authenticity) vulnerabilities

CVE-2026-35051 — Critical (CVSS 10.0): Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an…
CVE-2014-8165 — Critical (CVSS 10.0): scripts/amsvis/powerpcAMS/amsnet.py in powerpc-utils-python uses the pickle Python module unsafely, which allows remote…
CVE-2026-50195 — Critical (CVSS 9.9): containerd is an open-source container runtime. Versions prior to 2.3.2, 2.2.5 and 2.1.9 contain a vulnerability in the…
CVE-2022-36130 — Critical (CVSS 9.9): HashiCorp Boundary up to 0.10.1 did not properly perform data integrity checks to ensure the resources were associated…
CVE-2026-50214 — Critical (CVSS 9.8): The /v1/Plan service relies entirely on a shared global API token for full administrative management, allowing…
CVE-2025-15385 — Critical (CVSS 9.8): Insufficient Verification of Data Authenticity vulnerability in TECNO Mobile com.Afmobi.Boomplayer allows…

Browse all CWE-345 (Insufficient Verification of Data Authenticity) vulnerabilities →