9.8

CVE-2020-2509: QNAP Network-Attached Storage (NAS) Command Injection Vulnerability

KEV
Analyzed
Published 17-04-2021Last modified 21-10-2025

Vulnerability summary

CVE-2020-2509 is a critical (CVSS 9.8) Command Injection vulnerability in QNAP QNAP Network-Attached Storage (NAS). It is known to be exploited: CISA lists it, first on 11-04-2022. EPSS estimates a 33.99% chance of exploitation in the next 30 days, higher than 98.3% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
33.99%
0%100%
High · +0.61 pp in 30 days
KEVExploited in the wildCritical · listed in 1 catalog
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 17-04-2021
    PublishedVulnerability first disclosed.
  2. 11-04-2022
    Added to CISA KEVExploitedQNAP Network-Attached Storage (NAS) Command Injection Vulnerability
  3. 02-05-2022
    CISA remediation dueDeadline passedApply updates per vendor instructions.
  4. 21-10-2025
    Last modifiedVulnerability information updated.

Description

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

33.99%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

Increase +0.61 pp

From 33.38% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
11-04-2022
Federal due date
02-05-2022
ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2020-2509

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Qnap2 products
  • qts< 4.2.6 | ≥ 4.3.5, < 4.3.6 | ≥ 4.4.0, < 4.5.1 | 4.2.6 | 4.2.6:build_20170517 | 4.2.6:build_20190322 | 4.2.6:build_20190730 | 4.2.6:build_20190921 | 4.2.6:build_20191107 | 4.2.6:build_20200109 | 4.2.6:build_20200421 | 4.2.6:build_20200611 | 4.2.6:build_20200821 | 4.3.3.0174 | 4.3.3.0868 | 4.3.3.0998 | 4.3.3.1051 | 4.3.3.1098 | 4.3.3.1161 | 4.3.3.1252 | 4.3.3.1315 | 4.3.3.1386 | 4.3.3.1432 | 4.3.4.0358 | 4.3.4.0358:beta1 | 4.3.4.0370 | 4.3.4.0370:beta1 | 4.3.4.0372 | 4.3.4.0372:beta1 | 4.3.4.0374 | 4.3.4.0374:beta1 | 4.3.4.0387 | 4.3.4.0387:beta2 | 4.3.4.0411 | 4.3.4.0416 | 4.3.4.0427 | 4.3.4.0434 | 4.3.4.0435 | 4.3.4.0451 | 4.3.4.0483 | 4.3.4.0486 | 4.3.4.0506 | 4.3.4.0516 | 4.3.4.0526 | 4.3.4.0551 | 4.3.4.0557 | 4.3.4.0561 | 4.3.4.0569 | 4.3.4.0593 | 4.3.4.0597 | 4.3.4.0604 | 4.3.4.0899 | 4.3.4.1029 | 4.3.4.1082 | 4.3.4.1190 | 4.3.4.1282 | 4.3.4.1368 | 4.3.4.1417 | 4.3.4.1463 | 4.3.6 | 4.3.6.0895 | 4.3.6.0907 | 4.3.6.0923 | 4.3.6.0944 | 4.3.6.0959 | 4.3.6.0979 | 4.3.6.0993 | 4.3.6.1013 | 4.3.6.1033 | 4.3.6.1070 | 4.3.6.1154 | 4.3.6.1218 | 4.3.6.1263 | 4.3.6.1286 | 4.3.6.1333 | 4.3.6.1411 | 4.3.6.1446 | 4.5.1 | 4.5.1.1456 | 4.5.1.1461 | 4.5.1.1465 | 4.5.1.1480 | 4.5.2
  • quts_hero< h4.5.1 | h4.5.1 | h4.5.1.1472
Qnap systems inc.2 products
  • qts≥ unspecified, < 4.5.2.1566 Build 20210202 | ≥ unspecified, < 4.5.1.1495 Build 20201123 | ≥ unspecified, < 4.3.6.1620 Build 20210322 | ≥ unspecified, < 4.3.4.1632 Build 20210324 | ≥ unspecified, < 4.3.3.1624 Build 20210416 | ≥ unspecified, < 4.2.6 Build 20210327
  • quts hero≥ unspecified, < h4.5.1.1491 build 20201119

2 vendors · 4 products

References

2 links