Vulnerability in Dell Idrac9 Firmware
CVE-2021-21539
Dell EMC iDRAC9 versions prior to 4.40.00.00 contain a Time-of-check Time-of-use (TOCTOU) race condition vulnerability. A remote authenticated attacker could potentially exploit this vulnerability to gain elevated privileges when a user with higher privileges is simultaneously accessing iDRAC through the web interface.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Dell Idrac9 Firmware
- Dell Integrated Remote Access Controller (Idrac) — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.dell.com/support/kbdoc/000185293 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-21539?
- CVE-2021-21539 is a medium-severity vulnerability in Dell Idrac9 Firmware, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 5.9/10. Published 2021-04-30.
- How severe is CVE-2021-21539?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2021-21539 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.