CVE-2025-55321
CVE-2025-55321 is a critical-severity vulnerability in Microsoft Azure Monitor with a CVSS 3.x base score of 9.3. 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: Critical (CVSS 3.x base score 9.3)
- EPSS exploit prediction: 0% (33rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-33550
- Weakness: CWE-79
- Affected product: Microsoft Azure Monitor
- Published:
- Last modified:
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network.
Frequently asked questions
- What is CVE-2025-55321?
- Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network.
- How severe is CVE-2025-55321?
- CVE-2025-55321 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2025-55321 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-55321?
- CVE-2025-55321 affects Microsoft Azure Monitor. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-55321?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2025-55321 have an EU (EUVD) identifier?
- Yes. CVE-2025-55321 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33550.
- When was CVE-2025-55321 published?
- CVE-2025-55321 was published on 2025-10-09 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:microsoft:azure_monitor:-:*:*:*:*:*:*:*
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