Serv-U vulnerabilitiesAnd the versions its exploited flaws hit.
Serv-U is made by Solarwinds. We track 31 published vulnerabilities listed under that exact name, across 21 versions. 4 of them are on the list of flaws known to be exploited, the newest added on 5 June 2026. Solarwinds lists newer releases under their own names, such as Serv-U File Server, so check those pages too.
The most recent Serv-U flaw added to the known-exploited list is CVE-2026-28318, on 5 June 2026. We keep watching the known-exploited list.
Is Serv-U listed under other names? Yes.
Solarwinds also lists Serv-U under more specific names, such as Serv-U File Server and Serv-U FTP Server. Flaws listed only under those names are counted on their own pages, not here. If you run one of these, open its page for its own exploited flaws.
Which versions of Serv-U do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "before 15.5.4" means every version up to, but not including, 15.5.4. Find your version, then patch.
- CVE-2026-28318Exploited list, 5 Jun 2026
SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
before 15.5.415.5.4 - CVE-2024-28995Exploited list, 17 Jul 2024
SolarWinds Serv-U Path Traversal Vulnerability
before 15.4.215.4.215.4.2-hotfix1 - CVE-2021-35247Exploited list, 21 Jan 2022
SolarWinds Serv-U Improper Input Validation Vulnerability
before 15.3 - CVE-2021-35211Exploited list, 3 Nov 2021
SolarWinds Serv-U Remote Code Execution Vulnerability
before 15.2.315.2.315.2.3-hotfix1
Which Serv-U vulnerabilities are being exploited?
4 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.5SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
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.
- 8.6SolarWinds Serv-U Path Traversal Vulnerability
SolarWinds Serv-U contains a path traversal vulnerability that allows an attacker access to read sensitive files on the host machine.
- 4.3SolarWinds Serv-U Improper Input Validation Vulnerability
SolarWinds Serv-U versions 15.2.5 and earlier contain an improper input validation vulnerability that allows attackers to build and send queries without sanitization.
- 9.0SolarWinds Serv-U Remote Code Execution Vulnerability
SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.
Which Serv-U flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
SolarWinds Serv-U was susceptible to a directory transversal vulnerability that would allow access to read sensitive files on the host machine.
- 91%
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability.
- 44%
SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate.
- 13%CVE-2021-35250High
A researcher reported a Directory Transversal Vulnerability in Serv-U 15.3.
- 6.3%CVE-2024-45711High
SolarWinds Serv-U is vulnerable to a directory traversal vulnerability where remote code execution is possible depending on privileges given to the authenticated user.
- 4.0%CVE-2020-27994Medium
SolarWinds Serv-U before 15.2.2 allows Authenticated Directory Traversal.
- 3.8%CVE-2020-28001Medium
SolarWinds Serv-U before 15.2.2 allows Authenticated Stored XSS.
- 3.5%
Serv-U web login screen to LDAP authentication was allowing characters that were not sufficiently sanitized.
- 2.9%CVE-2021-35223High
The Serv-U File Server allows for events such as user login failures to be audited by executing a command.
- 1.7%CVE-2021-32604Medium
Share/IncomingWizard.htm in SolarWinds Serv-U before 15.2.3 mishandles the user-supplied SenderEmail parameter, aka "Share URL XSS."
Running Serv-U? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
- We match it to every flawOver 400,000 published flaws, checked against your list.
- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
- Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
Free plan, no card needed. Nothing to install.
1 flaw being exploited affects software Acme tracks
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.
- Matched to
- Serv-U on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 31 published vulnerabilities listed under the name Serv-U, across 21 versions. The most recent Serv-U flaw added to the known-exploited list is CVE-2026-28318, on 5 June 2026.
4 are on the list of flaws known to be exploited. The most recently added are CVE-2026-28318, CVE-2024-28995 and CVE-2021-35247.
Solarwinds also lists Serv-U under more specific names, such as Serv-U File Server and Serv-U FTP Server. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.
Each flaw names its own versions, usually as ranges. The newest, CVE-2026-28318, affects before 15.5.4, 15.5.4. The versions for every exploited flaw are listed on this page.
Create a EdgeProtect account and track Serv-U. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.