CVE-2026-28318

CRITICALPre-NVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-06-05), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 7.5 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 40%CVSS: 7.5Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
40%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

June 4, 2026

Last Modified

July 22, 2026

Advisory Details (2)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

Serv-U 15.5.4 Hotfix 1 release notes

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm
generic

SolarWinds Trust Center Security Advisories | CVE-2026-28318 | SolarWinds

https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318

Vendor Advisories for CVE-2026-28318(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 60× in last 7d / 265× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 889 total refreshes for this CVE.

  1. 2026-09-16 06:53 UTCEG score recompute
  2. 2026-09-16 06:53 UTCGHSA enrichment
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-16 03:17 UTCGHSA enrichment
  5. 2026-09-15 23:40 UTCGHSA enrichment
  6. 2026-09-15 20:04 UTCGHSA enrichment
  7. 2026-09-15 16:26 UTCGHSA enrichment
  8. 2026-09-15 12:49 UTCGHSA enrichment
  9. 2026-09-15 09:12 UTCGHSA enrichment
  10. 2026-09-15 05:35 UTCEG score recompute
  11. 2026-09-15 05:35 UTCGHSA enrichment
  12. 2026-09-15 01:59 UTCGHSA enrichment
  13. 2026-09-14 22:21 UTCGHSA enrichment
  14. 2026-09-14 19:24 UTCCISA KEV update
  15. 2026-09-14 18:44 UTCGHSA enrichment
  16. 2026-09-14 15:06 UTCGHSA enrichment
  17. 2026-09-14 11:29 UTCGHSA enrichment
  18. 2026-09-14 07:52 UTCGHSA enrichment
  19. 2026-09-14 04:16 UTCGHSA enrichment
  20. 2026-09-14 00:40 UTCGHSA enrichment
  21. 2026-09-13 21:03 UTCGHSA enrichment
  22. 2026-09-13 17:26 UTCGHSA enrichment
  23. 2026-09-13 13:49 UTCGHSA enrichment
  24. 2026-09-13 10:12 UTCGHSA enrichment
  25. 2026-09-13 06:35 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 02:58 UTCGHSA enrichment
  2. 2026-09-12 23:22 UTCGHSA enrichment
  3. 2026-09-12 19:45 UTCGHSA enrichment
  4. 2026-09-12 16:08 UTCEG score recompute
  5. 2026-09-12 16:08 UTCGHSA enrichment
  6. 2026-09-12 15:01 UTCEPSS rescore
  7. 2026-09-12 12:32 UTCGHSA enrichment
  8. 2026-09-12 08:55 UTCGHSA enrichment
  9. 2026-09-12 05:18 UTCGHSA enrichment
  10. 2026-09-12 01:41 UTCGHSA enrichment
  11. 2026-09-11 22:04 UTCGHSA enrichment
  12. 2026-09-11 18:49 UTCCISA KEV update
  13. 2026-09-11 18:28 UTCEG score recompute
  14. 2026-09-11 18:28 UTCGHSA enrichment
  15. 2026-09-11 14:52 UTCEPSS rescore
  16. 2026-09-11 14:51 UTCGHSA enrichment
  17. 2026-09-11 11:13 UTCEG score recompute
  18. 2026-09-11 11:12 UTCGHSA enrichment
  19. 2026-09-11 07:34 UTCGHSA enrichment
  20. 2026-09-11 03:57 UTCGHSA enrichment
  21. 2026-09-11 00:20 UTCGHSA enrichment
  22. 2026-09-10 20:43 UTCGHSA enrichment
  23. 2026-09-10 19:28 UTCCISA KEV update
  24. 2026-09-10 17:06 UTCGHSA enrichment
  25. 2026-09-10 13:29 UTCGHSA enrichment
  26. 2026-09-10 09:52 UTCEG score recompute
  27. 2026-09-10 09:52 UTCGHSA enrichment
  28. 2026-09-10 09:34 UTCEPSS rescore
  29. 2026-09-10 06:15 UTCGHSA enrichment
  30. 2026-09-10 02:38 UTCGHSA enrichment
  31. 2026-09-09 23:02 UTCGHSA enrichment
  32. 2026-09-09 19:25 UTCGHSA enrichment
  33. 2026-09-09 19:08 UTCCISA KEV update
  34. 2026-09-09 15:48 UTCGHSA enrichment
  35. 2026-09-09 12:11 UTCGHSA enrichment
  36. 2026-09-09 08:34 UTCGHSA enrichment
  37. 2026-09-09 04:57 UTCGHSA enrichment
  38. 2026-09-09 01:20 UTCGHSA enrichment
  39. 2026-09-08 21:43 UTCGHSA enrichment
  40. 2026-09-08 18:54 UTCCISA KEV update
  41. 2026-09-08 18:05 UTCGHSA enrichment
  42. 2026-09-08 14:04 UTCGHSA enrichment
  43. 2026-09-08 10:27 UTCGHSA enrichment
  44. 2026-09-08 06:48 UTCGHSA enrichment
  45. 2026-09-08 03:11 UTCGHSA enrichment
  46. 2026-09-07 23:33 UTCGHSA enrichment
  47. 2026-09-07 19:56 UTCGHSA enrichment
  48. 2026-09-07 16:19 UTCGHSA enrichment
  49. 2026-09-07 12:42 UTCGHSA enrichment
  50. 2026-09-07 09:04 UTCGHSA enrichment
  51. 2026-09-07 05:26 UTCGHSA enrichment
  52. 2026-09-07 01:46 UTCGHSA enrichment
  53. 2026-09-06 22:08 UTCGHSA enrichment
  54. 2026-09-06 18:31 UTCGHSA enrichment
  55. 2026-09-06 14:54 UTCEG score recompute
  56. 2026-09-06 14:54 UTCGHSA enrichment
  57. 2026-09-06 13:47 UTCEPSS rescore
  58. 2026-09-06 13:47 UTCEPSS rescore
  59. 2026-09-06 11:17 UTCGHSA enrichment
  60. 2026-09-06 07:40 UTCGHSA enrichment
  61. 2026-09-06 04:03 UTCGHSA enrichment
  62. 2026-09-06 00:27 UTCGHSA enrichment
  63. 2026-09-05 20:50 UTCGHSA enrichment
  64. 2026-09-05 17:14 UTCEG score recompute
  65. 2026-09-05 17:14 UTCGHSA enrichment
  66. 2026-09-05 13:36 UTCGHSA enrichment
  67. 2026-09-05 09:58 UTCGHSA enrichment
  68. 2026-09-05 06:20 UTCGHSA enrichment
  69. 2026-09-05 02:43 UTCGHSA enrichment
  70. 2026-09-04 23:06 UTCGHSA enrichment
  71. 2026-09-04 19:26 UTCGHSA enrichment
  72. 2026-09-04 17:38 UTCCISA KEV update
  73. 2026-09-04 15:49 UTCEG score recompute
  74. 2026-09-04 15:49 UTCGHSA enrichment
  75. 2026-09-04 12:12 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCBishopFox/CVE-2026-28318-check
    First seen Jun 12, 2026

    Safely detect whether a SolarWinds Serv-U host is vulnerable to CVE-2026-28318

    Open source ↗

Frequently asked(6)

What is CVE-2026-28318?
CVE-2026-28318 is a critical vulnerability published on June 4, 2026. 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
When was CVE-2026-28318 disclosed?
CVE-2026-28318 was first published in the National Vulnerability Database on June 4, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28318 actively exploited?
Yes. CISA added CVE-2026-28318 to the Known Exploited Vulnerabilities catalog on June 5, 2026, affecting SolarWinds Serv-U. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-28318?
CVE-2026-28318 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-28318?
CVE-2026-28318 affects SolarWinds Serv-U. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-28318?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28318, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-28318

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