How severe is CVE-2022-40740?

CVE-2022-40740 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-2022-40740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40740?

CVE-2022-40740 primarily affects Realtek Usdk. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-40740?

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-2022-40740 published?

CVE-2022-40740 was published on 2023-01-03 and last updated on 2026-06-17.

CVE-2022-40740

CVE-2022-40740 is a high-severity vulnerability in Realtek Usdk 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)
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Realtek Usdk
Published: 2023-01-03
Last modified: 2026-06-17

Description

Realtek GPON router has insufficient filtering for special characters. A remote attacker authenticated as an administrator can exploit this vulnerability to perform command injection attacks, to execute arbitrary system command, manipulate system or disrupt service.

Frequently asked questions

What is CVE-2022-40740?: Realtek GPON router has insufficient filtering for special characters. A remote attacker authenticated as an administrator can exploit this vulnerability to perform command injection attacks, to execute arbitrary system command, manipulate system or disrupt service.
How severe is CVE-2022-40740?: CVE-2022-40740 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-2022-40740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40740?: CVE-2022-40740 primarily affects Realtek Usdk. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-40740?: 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-2022-40740 published?: CVE-2022-40740 was published on 2023-01-03 and last updated on 2026-06-17.

References

https://www.twcert.org.tw/tw/cp-132-6831-19121-1.html

Affected products (7)

cpe:2.3:a:realtek:usdk:1.0:*:*:*:*:*:*:*
cpe:2.3:a:realtek:usdk:2.0:*:*:*:*:*:*:*
cpe:2.3:a:realtek:usdk:2.2:*:*:*:*:*:*:*
cpe:2.3:a:realtek:xpon_software_development_kit:1.9:*:*:*:*:*:*:*
cpe:2.3:a:realtek:xpon_software_development_kit:3.3:*:*:*:*:*:*:*
cpe:2.3:a:realtek:xpon_software_development_kit:4.0:*:*:*:*:*:*:*
cpe:2.3:a:realtek:xpon_software_development_kit:4.1:*:*:*:*:*:*:*

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