Threats / Zoho / CVE-2020-10189
CVE-2020-10189
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Zoho ManageEngine vulnerability
Zoho ManageEngine Desktop Central contains an unauthenticated file upload vulnerability enabling remote code execution via deserialization of untrusted data.
Verdict
Today item — known-exploited.
An unauthenticated attacker can upload malicious files to execute arbitrary code on affected ManageEngine instances without authentication, leading to full system compromise. Active exploitation in the wild increases risk.
CISA KEV Yes · 2021-11-035EPSS 0.99941 (verify live)6Exploit Weaponized · public PoC7CVSS 9.83CISA SSVC Exploitation: active · Automatable: yes · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
466 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03).
Probability (EPSS)
EPSS 0.99941 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.0/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N) · Affected: Zoho, ManageEngine. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.0, set at disclosure.
Weakness (CWE)
Mapped to CWE-502 Deserialization of Untrusted Data — weakness family: Injection.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 607 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a functional/weaponized public exploit). Catalog entries: Metasploit module, nuclei template. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify the ManageEngine instance and craft a malicious file upload request that bypasses authentication controls.
Business
Attackers gain initial access to critical IT management infrastructure without credentials, establishing a foothold for lateral movement.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I upload a serialized Java object containing gadget chains that execute arbitrary code when deserialized by the application.
Business
Remote code execution on the ManageEngine server grants attackers the ability to execute commands with application privileges.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute system commands to establish persistence, exfiltrate data, or pivot to other network assets managed by Desktop Central.
Business
Compromise of ManageEngine exposes all managed endpoints and credentials, enabling widespread lateral movement across the organization's IT infrastructure.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05