CVE-2023-27855

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-03-22. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 13%CVSS: 9.8Exploit: Metasploit · epss top5pct · public exploitExposed: 0

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

In affected versions, a path traversal exists when processing a message in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker could potentially exploit this vulnerability to upload arbitrary files to any directory on the disk drive where ThinServer.exe is installed. The attacker could overwrite existing executable files with attacker-controlled, malicious contents, potentially causing remote code execution.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
85(Track)
EG Risk 85/100SSVC: Track

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
Severity98% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
13%
EPSS %ILE
96%
KEV
Not listed

Published

March 22, 2023

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jul 29, 2026
No patch confirmed yet.
generic

ThinManager Software Path Traversal and Denial-Of-Service Attack

https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1138640

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 41× 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.

  1. 2026-07-30 16:26 UTCEPSS rescore
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  9. 2026-07-23 02:20 UTCEG score recompute
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  44. 2026-06-10 22:17 UTCEPSS rescore
  45. 2026-06-08 14:15 UTCEPSS rescore
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  56. 2026-05-31 00:15 UTCEPSS rescore
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  58. 2026-05-29 13:43 UTCEPSS rescore
  59. 2026-05-25 04:54 UTCEG score recompute
  60. 2026-05-25 04:54 UTCGHSA enrichment

Publicly available exploits

(1 reference)

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

  • Metasploitauxiliary/admin/networking/thinmanager_traversal_upload✓ verified
    First seen Apr 5, 2023

    ThinManager Path Traversal (CVE-2023-27855) Arbitrary File Upload

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-27855?
CVE-2023-27855 is a critical vulnerability published on March 22, 2023. In affected versions, a path traversal exists when processing a message in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker could potentially exploit this vulnerability to upload arbitrary files to any directory on the disk drive where ThinServer.exe is installed.…
When was CVE-2023-27855 disclosed?
CVE-2023-27855 was first published in the National Vulnerability Database on March 22, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-27855 actively exploited?
CVE-2023-27855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days, which ranks it in the top 4.0% of all scored CVEs.
What is the CVSS score of CVE-2023-27855?
CVE-2023-27855 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-27855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-27855, 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

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