Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L H N U H N N 4.9 .5023 98.8 YES
AFFECTED Product Versions Fixed Email Security 10.0.9 and earlier – —
TIMELINE Dec 17 Reserved by sonicwall Nov 3 Added to CISA KEV, remediation due 2021-11-17 Nov 3 Published (CNA: sonicwall)
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.
| Date | Event | Detail |
|---|---|---|
| December 17, 2020 | Reserved | Reserved by sonicwall |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2021-11-17 |
| November 3, 2021 | Published | Published (CNA: sonicwall) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| SonicWall | Email Security | — | 10.0.9 and earlier | — |
Authoritative record: CVE-2021-20023 at cve.org
Vendors: sonicwall
Weaknesses: CWE-22
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-20023 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.