How severe is CVE-2021-35503?

CVE-2021-35503 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-35503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35503?

CVE-2021-35503 affects Afian Filerun. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35503?

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

When was CVE-2021-35503 published?

CVE-2021-35503 was published on 2021-10-05 and last updated on 2026-07-05.

CVE-2021-35503

CVE-2021-35503 is a medium-severity vulnerability in Afian Filerun with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Afian Filerun
Published: 2021-10-05
Last modified: 2026-07-05

Description

Afian FileRun 2021.03.26 allows stored XSS via an HTTP X-Forwarded-For header that is mishandled when rendering Activity Logs.

Frequently asked questions

What is CVE-2021-35503?: Afian FileRun 2021.03.26 allows stored XSS via an HTTP X-Forwarded-For header that is mishandled when rendering Activity Logs.
How severe is CVE-2021-35503?: CVE-2021-35503 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-35503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35503?: CVE-2021-35503 affects Afian Filerun. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-35503 published?: CVE-2021-35503 was published on 2021-10-05 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:afian:filerun:2021.03.26:*:*:*:*:*:*:*

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