CVE-2021-21559: dell emc_networker Improper Certificate Validation
Vulnerability summary
CVE-2021-21559 is a high (CVSS 7.1) Improper Certificate Validation vulnerability in dell emc_networker. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.4% of scored vulnerabilities.
Timeline
- 08-06-2021PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
Description
Dell EMC NetWorker, versions 18.x, 19.1.x, 19.2.x 19.3.x, 19.4, and 19.4.0.1 contain an Improper Certificate Validation vulnerability in the client (NetWorker Management Console) components which uses SSL encrypted connection in order to communicate with the application server. An unauthenticated attacker in the same network collision domain as the NetWorker Management Console client could potentially exploit this vulnerability to perform man-in-the-middle attacks to intercept and tamper the traffic between the client and the application server.
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST5.3MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NDiffers
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
0.00 pp
From 0.17% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Dell2 products
- emc_networker≥ 18.1.0.1, < 19.4.0.2
- networker≥ unspecified, < 19.4.0.2
1 vendor · 2 products