Vulnerability in Solarwinds Serv-U
CVE-2026-28321
SolarWinds Serv-U is affected by a broken access control vulnerability that could allow arbitrary file read and write, which can then be used to escalate privileges and execute code as root. A domain administrator access is required, and the impact is lower in Windows installations.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Solarwinds Serv-U — versions 15.5.4 HF1 and below
Weakness classification (CWE)
References
- www.solarwinds.com/trust-center/security-advisories/CVE-2026-28321 (vendor-advisory, Vendor Advisory)
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (release-notes, Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-28321?
- CVE-2026-28321 is a critical-severity vulnerability in Solarwinds Serv-U, classified under Improper Access Control. CVSS score: 9.1/10. Published 2026-07-21.
- How severe is CVE-2026-28321?
- Critical severity. CVSS v3 base score is 9.1 out of 10.