How severe is CVE-2021-3043?

CVE-2021-3043 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3043 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3043?

CVE-2021-3043 affects Paloaltonetworks Prisma Cloud. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3043?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3043 published?

CVE-2021-3043 was published on 2021-07-15 and last updated on 2026-06-17.

CVE-2021-3043

CVE-2021-3043 is a high-severity vulnerability in Paloaltonetworks Prisma Cloud with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Paloaltonetworks Prisma Cloud
Published: 2021-07-15
Last modified: 2026-06-17

Description

A reflected cross-site scripting (XSS) vulnerability exists in the Prisma Cloud Compute web console that enables a remote attacker to execute arbitrary JavaScript code in the browser-based web console while an authenticated administrator is using that web interface. Prisma Cloud Compute SaaS versions were automatically upgraded to the fixed release. No additional action is required for these instances. This issue impacts: Prisma Cloud Compute 20.12 versions earlier than Prisma Cloud Compute 20.12.552; Prisma Cloud Compute 21.04 versions earlier than Prisma Cloud Compute 21.04.439.

Frequently asked questions

What is CVE-2021-3043?: A reflected cross-site scripting (XSS) vulnerability exists in the Prisma Cloud Compute web console that enables a remote attacker to execute arbitrary JavaScript code in the browser-based web console while an authenticated administrator is using that web interface. Prisma Cloud Compute SaaS versions were automatically upgraded to the fixed release. No additional action is required for these instances. This issue impacts: Prisma Cloud Compute 20.12 versions earlier than Prisma Cloud Compute 20.12.552; Prisma Cloud Compute 21.04 versions earlier than Prisma Cloud Compute 21.04.439.
How severe is CVE-2021-3043?: CVE-2021-3043 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3043 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3043?: CVE-2021-3043 affects Paloaltonetworks Prisma Cloud. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3043?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3043 published?: CVE-2021-3043 was published on 2021-07-15 and last updated on 2026-06-17.

References

https://security.paloaltonetworks.com/CVE-2021-3043

Affected products (1)

cpe:2.3:a:paloaltonetworks:prisma_cloud:*:*:*:*:compute:*:*:*

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