CVE-2026-28318 (GCVE-0-2026-28318)

Vulnerability from cvelistv5 – Published: 2026-06-04 14:05 – Updated: 2026-10-21 10:29
VLAI CISA Previdian
Title
SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability
Summary
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
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-05 00:00 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
SolarWinds CNA under the mitre root
CNA scorecard B 83/100 over 30 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
SolarWinds Serv-U Affected: 0 , ≤ 15.5.4 (custom)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b00d5422-d924-4e37-a319-af4fa11ed523

Vulnerability ID: CVE-2026-28318

Status: Confirmed

Status Updated: 2026-06-05 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-05
Asserted: 2026-06-05
Scope
Notes: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability | Affected: SolarWinds / Serv-U | Description: 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. | 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. | Due date: 2026-06-19 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-400
Feed CISA Known Exploited Vulnerabilities Catalog
Product Serv-U
Due Date 2026-06-19
Date Added 2026-06-05
Vendorproject SolarWinds
Vulnerabilityname SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-06-05 18:00 UTC | Updated: 2026-11-04 13:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0ab957d4-f6b3-43d3-a77c-8866fbe67fcb

Vulnerability ID: CVE-2026-28318

Status: Confirmed

Status Updated: 2026-06-05 18:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-05
Asserted: 2026-06-05
Scope
Notes: KEVIntel entry: SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability | Affected: SolarWinds / Serv-U | CVSS: 7.5 (HIGH) | EPSS: 0.01054 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability
Vendor SolarWinds
Product Serv-U
Added Date 2026-06-05T18:00:36.180Z
Cvss Score 7.5
Epss Score 0.01054
Cvss Severity HIGH
Epss Percentile 0.59929
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Solutions

CNA · SolarWinds
Upgrade to SolarWinds Serv-U 15.5.4 Hotfix 1. Use the mitigation steps until the upgrade is possible.

Workarounds

CNA · SolarWinds
Block any POST requests containing 'Content-Encoding: deflate'. This function is not required for SolarWinds Serv-U.

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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.