SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
SolarWinds — Serv-U
SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provided to secure customer environments in the SolarWinds Trust Center if you are unable to deploy the update
7.5
40.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- Jun 4, 2026
- Modified
- Jul 22, 2026
- Added to KEV
- Jun 5, 2026
- Federal patch due
- Jun 19, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
2 foundWeaponization
Public repositories whose name or description references CVE-2026-28318, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- BishopFox/CVE-2026-28318-check★ 1
Safely detect whether a SolarWinds Serv-U host is vulnerable to CVE-2026-28318
updated Aug 27, 2026
- EaEa0001/servu-cve-2026-28318-poc★ 1
SolarWinds Serv-U CVE-2026-28318: unauthenticated Content-Encoding: deflate crash. Root-cause analysis (invalid free of an interior pointer -> heap corruption) + DoS-only PoC. Fixed in 15.5.4 Hotfix 1.
updated Jun 10, 2026
References
Frequently asked questions
What is CVE-2026-28318?
SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provided to secure customer environments in the SolarWinds Trust Center if you are unable to deploy the update
How severe is CVE-2026-28318?
CVE-2026-28318 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).
Is CVE-2026-28318 actively exploited in the wild?
Yes. CVE-2026-28318 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 5, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-28318?
40.0% - meaning FIRST.org's EPSS model estimates a 40.0% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2026-28318?
We found 2 public GitHub repositories referencing CVE-2026-28318, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2026-28318?
CVE-2026-28318 is classified under CWE-400 (CWE-400 Uncontrolled Resource Consumption).
Cross-checked against
Impactr finds and proves whether CVE-2026-28318 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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