How severe is CVE-2021-20484?

CVE-2021-20484 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-2021-20484 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20484?

CVE-2021-20484 affects Ibm Sterling File Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20484?

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

When was CVE-2021-20484 published?

CVE-2021-20484 was published on 2021-09-23 and last updated on 2026-06-17.

CVE-2021-20484

CVE-2021-20484 is a medium-severity vulnerability in Ibm Sterling File Gateway 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% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Ibm Sterling File Gateway
Published: 2021-09-23
Last modified: 2026-06-17

Description

IBM Sterling File Gateway 2.2.0.0 through 6.1.0.3 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 197666.

Frequently asked questions

What is CVE-2021-20484?: IBM Sterling File Gateway 2.2.0.0 through 6.1.0.3 is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session. IBM X-Force ID: 197666.
How severe is CVE-2021-20484?: CVE-2021-20484 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-2021-20484 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20484?: CVE-2021-20484 affects Ibm Sterling File Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20484?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20484 published?: CVE-2021-20484 was published on 2021-09-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ibm:sterling_file_gateway:*:*:*:*:*:*:*:*

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