CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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
Description quoted from the CVE record (assigned by SolarWinds, published 2026-06-04).
Weakness: CWE-400 Uncontrolled Resource Consumption
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: 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
CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: partial.
- On CISA KEV since
- 2026-06-05
- US federal deadline
- 2026-06-19
- Ransomware use
- Not known
Public exploit evidence (Exploit Observer)
Also known as: BDU:2026-07860, EUVD-2026-34268, GHSA-4vx4-vp54-mwmc
Exploit Observer links 4 pieces of public exploit code or detection modules that name this CVE or one of its aliases.
Exploit code and modules (4)
Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.
- Code repository: https://github.com/bishopfox/cve-2026-28318-check
- Code repository: https://github.com/eaea0001/servu-cve-2026-28318-poc
- Code repository: https://github.com/jenniferreire26/cve-2026-28318
- Code repository: https://github.com/johnniebozura31/cve-2026-28318
Research and write-ups (1)
- Research or write-up: https://bishopfox.com/blog/a-crash-not-a-shell-solarwinds-serv-u-cve-2026-28318
Vulnerability databases and vendor advisories (5)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-34268
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-4vx4-vp54-mwmc
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-28318
- Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318
- Vulnerability database or vendor advisory: https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318
4 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.437
likely to be attacked soon - VEDAS
- 0.616
some exploit evidence - On CISA KEV
- Yes, since 2026-06-05
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| SolarWinds Serv-U | up to and including 15.5.4 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: solarwinds serv-u, solarwinds_inc. solarwinds_serv-u.
How to fix it
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.
Vendor guidance:
- https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318
- https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm#link7
- https://nvd.nist.gov/vuln/detail/CVE-2026-28318
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
References
Government sources
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318 (government-resource)
Other references
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318
- https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.