How severe is CVE-2021-33904?

CVE-2021-33904 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-2021-33904 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33904?

CVE-2021-33904 affects Accela Civic Platform. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33904?

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

When was CVE-2021-33904 published?

CVE-2021-33904 was published on 2021-06-07 and last updated on 2026-06-17.

CVE-2021-33904

CVE-2021-33904 is a medium-severity vulnerability in Accela Civic Platform with a CVSS 3.x base score of 6.1. Its EPSS exploit-prediction score of 10% places it in the 95th percentile, indicating an elevated likelihood of exploitation. 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: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Accela Civic Platform
Published: 2021-06-07
Last modified: 2026-06-17

Description

In Accela Civic Platform through 21.1, the security/hostSignon.do parameter servProvCode is vulnerable to XSS. NOTE: The vendor states "there are configurable security flags and we are unable to reproduce them with the available information.

Frequently asked questions

What is CVE-2021-33904?: In Accela Civic Platform through 21.1, the security/hostSignon.do parameter servProvCode is vulnerable to XSS. NOTE: The vendor states "there are configurable security flags and we are unable to reproduce them with the available information.
How severe is CVE-2021-33904?: CVE-2021-33904 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-2021-33904 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33904?: CVE-2021-33904 affects Accela Civic Platform. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33904?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-33904 published?: CVE-2021-33904 was published on 2021-06-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:accela:civic_platform:*:*:*:*:*:*:*:*

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