How severe is CVE-2026-28318?

CVE-2026-28318 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-28318 being actively exploited?

Yes. CVE-2026-28318 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-05, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-28318?

CVE-2026-28318 primarily affects Solarwinds Serv-u. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-28318?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-28318 have an EU (EUVD) identifier?

Yes. CVE-2026-28318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34268. It is also flagged as exploited in the EUVD (since 2026-06-05).

When was CVE-2026-28318 published?

CVE-2026-28318 was published on 2026-06-04 and last updated on 2026-06-17.

CVE-2026-28318

CVE-2026-28318 is a high-severity vulnerability in Solarwinds Serv-u with a CVSS 3.x base score of 7.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-05). The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-06-05)
EU (EUVD) id: EUVD-2026-34268
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-06-05)
Weakness: CWE-400
Affected product: Solarwinds Serv-u
Published: 2026-06-04
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2026-28318?: 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
How severe is CVE-2026-28318?: CVE-2026-28318 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-28318 being actively exploited?: Yes. CVE-2026-28318 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-05, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-28318?: CVE-2026-28318 primarily affects Solarwinds Serv-u. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-28318?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-28318 have an EU (EUVD) identifier?: Yes. CVE-2026-28318 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34268. It is also flagged as exploited in the EUVD (since 2026-06-05).
When was CVE-2026-28318 published?: CVE-2026-28318 was published on 2026-06-04 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*
cpe:2.3:a:solarwinds:serv-u:15.5.4:-:*:*:*:*:*:*

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