Vulnerability in Parallels Desktop
CVE-2021-34986
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.0 (49183). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the Parallels Service. By creating a symbolic link, an attacker can abuse the service to execute a file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13932.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Parallels Desktop — versions 16.5.0 (49183)
- Parallels Desktop — versions 16.5.0
Weakness classification (CWE)
References
- kb.parallels.com/en/125013 (Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-22-385/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34986?
- CVE-2021-34986 is a high-severity vulnerability in Parallels Desktop, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2022-07-15.
- How severe is CVE-2021-34986?
- High severity. CVSS v3 base score is 7.8 out of 10.