How severe is CVE-2021-34820?

CVE-2021-34820 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-34820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34820?

CVE-2021-34820 affects Aat Novus Management System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34820?

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-2021-34820 published?

CVE-2021-34820 was published on 2021-07-19 and last updated on 2026-06-17.

CVE-2021-34820

CVE-2021-34820 is a high-severity vulnerability in Aat Novus Management System with a CVSS 3.x base score of 7.5. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Aat Novus Management System
Published: 2021-07-19
Last modified: 2026-06-17

Description

Web Path Directory Traversal in the Novus HTTP Server. The Novus HTTP Server is affected by the Directory Traversal for Arbitrary File Access vulnerability. A remote, unauthenticated attacker using an HTTP GET request may be able to exploit this issue to access sensitive data. The issue was discovered in the NMS (Novus Management System) software through 1.51.2

Frequently asked questions

What is CVE-2021-34820?: Web Path Directory Traversal in the Novus HTTP Server. The Novus HTTP Server is affected by the Directory Traversal for Arbitrary File Access vulnerability. A remote, unauthenticated attacker using an HTTP GET request may be able to exploit this issue to access sensitive data. The issue was discovered in the NMS (Novus Management System) software through 1.51.2
How severe is CVE-2021-34820?: CVE-2021-34820 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-34820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34820?: CVE-2021-34820 affects Aat Novus Management System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34820?: 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-2021-34820 published?: CVE-2021-34820 was published on 2021-07-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:aat:novus_management_system:*:*:*:*:*:*:*:*

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