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CVE-2020-8599

74
FAUCET Score

CVE-2020-8599 is a critical arbitrary file write vulnerability affecting Trend Micro Apex One (2019) and OfficeScan XG servers. This flaw allows an unauthenticated remote attacker to write arbitrary data to any path on the affected system, potentially bypassing root login. With a CVSS score of 9.8 (Critical), it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited in the wild, as indicated by its inclusion in the KEV catalog, and has garnered significant community discussion, despite a lack of public exploit code on platforms like Metasploit or ExploitDB.

Impacted Technologies

VendorProductVersion(s)CPE
2019CPE matchmatch criteria
cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:*
xgCPE matchmatch criteria
cpe:2.3:a:trendmicro:officescan:xg:-:*:*:*:*:*:*
xgCPE matchmatch criteria
cpe:2.3:a:trendmicro:officescan:xg:sp1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
11.58%
Probability of exploitation in next 30 days
EPSS Percentile
95.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Added to KEV · Nov 3, 2021
This CVE's current EPSS score of 0.1158 is in the 91st percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
success.trendmicro.com / jp/solution/000244253
Broken LinkPatchVendor Advisory
success.trendmicro.com / solution/000245571
Broken LinkPatchVendor Advisory