CVE-2021-45837

CRITICALNVD 9.89.8—Weaponized

9.8

It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by sending a specifically crafted input to /tos/index.php?app/del.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 99.2%
KEV: Not listed

Published

April 25, 2022

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html
cve@mitrehttps://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html
af854a3a-2127-422b-91ae-364da2661108https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/

Data Freshness Timeline

(refreshed 9× in last 7d / 20× 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.

2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-26 07:17 UTCEPSS rescore
2026-05-26 07:17 UTCEPSS rescore
2026-05-26 07:17 UTCEPSS rescore

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.

Metasploitexploit/linux/http/terramaster_unauth_rce_cve_2021_45837✓ verified
First seen Dec 24, 2021
TerraMaster TOS 4.2.15 or lower - RCE chain from unauthenticated to root via session crafting.
Open source ↗

Frequently asked(5)

What is CVE-2021-45837?

CVE-2021-45837 is a critical vulnerability published on April 25, 2022. It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by sending a specifically crafted input to /tos/index.php?app/del.

When was CVE-2021-45837 disclosed?

CVE-2021-45837 was first published in the National Vulnerability Database on April 25, 2022, 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-2021-45837 actively exploited?

CVE-2021-45837 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-45837?

CVE-2021-45837 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-45837?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-45837, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-45837

Explore →

Is Your Infrastructure Affected by CVE-2021-45837?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-45837

📅 Published

🔄 Last Modified

🔗 References (4)