How severe is CVE-2022-40870?

CVE-2022-40870 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-40870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-40870?

CVE-2022-40870 affects Parallels Remote Application Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-40870?

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-2022-40870 published?

CVE-2022-40870 was published on 2022-11-23 and last updated on 2026-06-17.

CVE-2022-40870

CVE-2022-40870 is a high-severity vulnerability in Parallels Remote Application Server with a CVSS 3.x base score of 8.1. 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-116.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-116
Affected product: Parallels Remote Application Server
Published: 2022-11-23
Last modified: 2026-06-17

Description

The Web Client of Parallels Remote Application Server v18.0 is vulnerable to Host Header Injection attacks. This vulnerability allows attackers to execute arbitrary commands via a crafted payload injected into the Host header.

Frequently asked questions

What is CVE-2022-40870?: The Web Client of Parallels Remote Application Server v18.0 is vulnerable to Host Header Injection attacks. This vulnerability allows attackers to execute arbitrary commands via a crafted payload injected into the Host header.
How severe is CVE-2022-40870?: CVE-2022-40870 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-40870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-40870?: CVE-2022-40870 affects Parallels Remote Application Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-40870?: 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-2022-40870 published?: CVE-2022-40870 was published on 2022-11-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:parallels:remote_application_server:18.0:*:*:*:*:*:*:*

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