How severe is CVE-2021-28973?

CVE-2021-28973 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-28973 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28973?

CVE-2021-28973 affects Perforce Helix Alm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28973?

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

When was CVE-2021-28973 published?

CVE-2021-28973 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-28973

CVE-2021-28973 is a medium-severity vulnerability in Perforce Helix Alm with a CVSS 3.x base score of 4.9. 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-611.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Perforce Helix Alm
Published: 2021-04-13
Last modified: 2026-06-17

Description

The XML Import functionality of the Administration console in Perforce Helix ALM 2020.3.1 Build 22 accepts XML input data that is parsed by insecurely configured software components, leading to XXE attacks.

Frequently asked questions

What is CVE-2021-28973?: The XML Import functionality of the Administration console in Perforce Helix ALM 2020.3.1 Build 22 accepts XML input data that is parsed by insecurely configured software components, leading to XXE attacks.
How severe is CVE-2021-28973?: CVE-2021-28973 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-28973 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28973?: CVE-2021-28973 affects Perforce Helix Alm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28973?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28973 published?: CVE-2021-28973 was published on 2021-04-13 and last updated on 2026-06-17.

References

https://www.compass-security.com/fileadmin/Research/Advisories/2021-01_CSNC-2021-005_Helix_ALM_XXE.txt

Affected products (1)

cpe:2.3:a:perforce:helix_alm:2020.3.1:build_22:*:*:*:*:*:*

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