EUVD-2026-34268
GHSA-4vx4-vp54-mwmc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (SolarWinds) · only source for this CVE.
CVSS VectorVendor: SolarWinds
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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
Articles & Coverage 1
AnalysisAI
Remote denial-of-service in SolarWinds Serv-U allows unauthenticated attackers to crash the Serv-U service by sending specially crafted POST requests using Content-Encoding: deflate. The flaw carries a CVSS 7.5 (AV:N/AC:L/PR:N/UI:N) and maps to CWE-400 (uncontrolled resource consumption), affecting service availability without compromising confidentiality or integrity; no public exploit identified at time of analysis.
Technical ContextAI
SolarWinds Serv-U is a managed file transfer and secure FTP server that exposes an HTTP/HTTPS management and transfer interface. The vulnerability is rooted in CWE-400 (Uncontrolled Resource Consumption) within the HTTP request handler that processes the Content-Encoding: deflate header; the deflate-decompression code path appears to mishandle the inflated input, leading to an exception or resource exhaustion that terminates the Serv-U service. The single CPE 'cpe:2.3:a:solarwinds:serv-u' indicates the issue spans Serv-U versions prior to the hotfixed 15.5.4 Hotfix 1 release.
RemediationAI
Vendor-released patch: Serv-U 15.5.4 Hotfix 1 - upgrade affected Serv-U installations to this release per the vendor advisory at https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318 and release notes at https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm. If immediate patching is not possible, follow the mitigation steps SolarWinds publishes in its Trust Center; as compensating controls, restrict access to the Serv-U HTTP/HTTPS management and file-transfer ports to known IPs via firewall/WAF (trade-off: breaks anonymous or partner-initiated transfers from arbitrary sources) and configure an upstream proxy or WAF to drop requests carrying Content-Encoding: deflate to the Serv-U endpoints (trade-off: any legitimate clients relying on deflate-encoded uploads will fail). Pair with active monitoring/auto-restart of the Serv-U service to limit downtime if a crash is induced.
Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Mem
SolarWinds Serv-U was susceptible to a directory transversal vulnerability that would allow access to read sensitive fil
In SolarWinds Serv-U before 15.2.2 Hotfix 1, there is a directory containing user profile files (that include users' pas
A denial of service vulnerability in SolarWinds Serv-U before 15.1.6 HFv1 allows an authenticated user to crash the appl
Share/IncomingWizard.htm in SolarWinds Serv-U before 15.2.3 mishandles the user-supplied SenderEmail parameter, aka "Sha
Privilege escalation in SolarWinds Serv-U allows an authenticated domain administrator account to abuse an insecure dire
Privilege-scoped remote code execution in SolarWinds Serv-U managed file transfer server stems from an insecure direct o
Privilege-to-root remote code execution in SolarWinds Serv-U managed file transfer server stems from an insecure direct
Remote code execution in SolarWinds Serv-U managed file transfer/FTP server allows an attacker to run arbitrary code rem
Privilege escalation to remote code execution as root in SolarWinds Serv-U stems from an insecure direct object referenc
Account takeover in SolarWinds Serv-U managed file transfer server lets an authenticated user access and hijack other us
Privilege escalation to root/code execution in SolarWinds Serv-U (managed/secure file transfer server) arises from a bro
Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
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