How severe is CVE-2020-21639?

CVE-2020-21639 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-2020-21639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-21639?

CVE-2020-21639 affects Ruijie Rg-uac 6000-e50 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-21639?

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

When was CVE-2020-21639 published?

CVE-2020-21639 was published on 2021-11-16 and last updated on 2026-06-17.

CVE-2020-21639

CVE-2020-21639 is a medium-severity vulnerability in Ruijie Rg-uac 6000-e50 Firmware 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% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Ruijie Rg-uac 6000-e50 Firmware
Published: 2021-11-16
Last modified: 2026-06-17

Description

Ruijie RG-UAC 6000-E50 commit 9071227 was discovered to contain a cross-site scripting (XSS) vulnerability via the rule_name parameter. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

Frequently asked questions

What is CVE-2020-21639?: Ruijie RG-UAC 6000-E50 commit 9071227 was discovered to contain a cross-site scripting (XSS) vulnerability via the rule_name parameter. This vulnerability allows attackers to execute arbitrary web scripts or HTML via a crafted payload.
How severe is CVE-2020-21639?: CVE-2020-21639 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-2020-21639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-21639?: CVE-2020-21639 affects Ruijie Rg-uac 6000-e50 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-21639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-21639 published?: CVE-2020-21639 was published on 2021-11-16 and last updated on 2026-06-17.

References

https://github.com/Sm1L3ing/ACSEC/blob/master/Ruijie-RG-UAC

Affected products (1)

cpe:2.3:o:ruijie:rg-uac_6000-e50_firmware:-:*:*:*:*:*:*:*

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