Security readout for executives and security teams
Plain-English summary
CVE-2020-17396 is a local privilege escalation flaw in Parallels Desktop 15.1.4. An attacker already able to run low-privileged code on the Mac could escalate to kernel-level code execution, which can compromise system confidentiality, integrity, and availability.
Executive priority
Treat this as high priority for endpoints where Parallels is used by developers, administrators, or shared users. It is not a remote-first issue, but successful exploitation could grant kernel-level control after initial local code execution.
Technical view
The flaw is in the prl_hypervisor module. Improper validation of user-supplied data can cause an integer overflow before buffer allocation, enabling local low-privileged code to execute in kernel context. The CVSS 3.0 score is 8.8 with local attack vector and high impact.
Likely exposure
Exposure appears limited to systems running Parallels Desktop 15.1.4. The source bundle does not name other affected versions, editions, or platforms beyond this installation.
Exploitation context
Sources describe a local attack requiring prior low-privileged code execution. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation in the wild.
Researcher notes
The public description attributes the issue to CWE-190 integer overflow in prl_hypervisor and ties it to ZDI-CAN-11217. Available bundle evidence is sufficient for exposure triage, but remediation details should be taken from Parallels guidance.
Mitigation direction
- Inventory Parallels Desktop installations and identify version 15.1.4.
- Review Parallels KB 125013 and ZDI-20-1014 for vendor-approved remediation.
- Upgrade, replace, or remove affected installations according to vendor guidance.
- Limit local code execution paths on Macs running affected Parallels versions.
- Prioritize remediation on shared, developer, and administrator workstations.
Validation and detection
- Confirm whether Parallels Desktop 15.1.4 is installed on managed Macs.
- Verify the prl_hypervisor component is present only on expected systems.
- Check vendor advisory status before declaring a host remediated.
- Review endpoint telemetry for unexpected local privilege escalation activity.
- Document any systems where upgrade or removal is delayed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-17396 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H26Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.parallels.com/en/125013CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-20-1014/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.