CVE-2026-28318
SolarWinds Serv-U: Uncontrolled Resource Consumption
As of , CVE-2026-28318 in SolarWinds Serv-U is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.
- Exploited
- Yes: CISA listed it on 5 June 2026
- US federal deadline
- 19 June 202614 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- EPSS score
- 0.02Higher than 79% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: documentation.solarwinds.com and www.solarwinds.comLinks below, from CISA's entry.
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA's required action
What the flaw is
SolarWinds Serv-U contains an uncontrolled resource consumption vulnerability that allows specially crafted POST requests using the Content-Encoding: deflate header to crash the Serv-U service without authentication.
CISA's description
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
The CVE record's description, from SolarWinds
- CVE published
- 4 June 2026
- Assigned by
- SolarWinds
- CVSS
- 7.5 High (CVSS 3.1, from the CNA)
- CWE-400
- Uncontrolled Resource Consumption
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- yes
- CISA SSVC, technical impact
- partial
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Serv-U: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2024-28995Path Traversal | SolarWinds Serv-U | Patch this weekMetasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2021-35211Remote Code Execution | SolarWinds Serv-U | Patch this weekRansomware use; EPSS 0.91 | 0.91 | ||
| CVE-2021-35247Improper Input Validation | SolarWinds Serv-U | Patch soon | 0.03 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org