How severe is CVE-2021-35199?

CVE-2021-35199 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-35199 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-2021-35199?

CVE-2021-35199 affects Netscout Ngeniusone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35199?

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

When was CVE-2021-35199 published?

CVE-2021-35199 was published on 2021-09-30 and last updated on 2026-06-17.

CVE-2021-35199

CVE-2021-35199 is a medium-severity vulnerability in Netscout Ngeniusone with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Netscout Ngeniusone
Published: 2021-09-30
Last modified: 2026-06-17

Description

NETSCOUT nGeniusONE 6.3.0 build 1196 and earlier allows Stored Cross-Site Scripting (XSS) in UploadFile.

Frequently asked questions

What is CVE-2021-35199?: NETSCOUT nGeniusONE 6.3.0 build 1196 and earlier allows Stored Cross-Site Scripting (XSS) in UploadFile.
How severe is CVE-2021-35199?: CVE-2021-35199 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-35199 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-2021-35199?: CVE-2021-35199 affects Netscout Ngeniusone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35199?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35199 published?: CVE-2021-35199 was published on 2021-09-30 and last updated on 2026-06-17.

References

https://www.netscout.com/securityadvisories

Affected products (1)

cpe:2.3:a:netscout:ngeniusone:*:*:*:*:*:*:*:*

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