# CVE-2020-28653: CVE-2020-28653

- Exploited (CISA KEV): no
- Published: 2021-02-03
- CVSS: not scored
- EPSS: 77.9% (100th percentile)

Zoho ManageEngine OpManager Stable build before 125203 (and Released build before 125233) allows Remote Code Execution via the Smart Update Manager (SUM) servlet.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-10-21 | 2086 |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

### F5

- 2026-10-21 · new · rule 200204112
  > Added: signature 200204112 "ManageEngine OpManager Unsafe Deserialization" (Server Side Code Injection, risk High), systems: Java Servlets/JSP. References: CVE-2021-3287, CVE-2020-28653.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: partial (3 of 4 requests blocked), template CVE-2020-28653, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (3 of 4 requests blocked), template CVE-2020-28653, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2020-28653 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2020-28653