Security readout for executives and security teams
Plain-English summary
A flaw in Windows BITS can let an attacker abuse symbolic links to elevate privileges after reaching a vulnerable system. Successful exploitation could severely affect confidentiality, integrity, and availability. Because CISA lists this vulnerability as known exploited, unremediated affected Windows endpoints and servers warrant prompt attention.
Executive priority
Treat as a high-priority remediation item because exploitation is documented through CISA KEV and successful abuse can produce high business impact. Focus first on vulnerable high-value systems and unsupported releases. This vulnerability does not, by itself, establish a remote compromise path, but it can materially amplify an existing intrusion.
Technical view
CVE-2020-0787 is a CWE-59 symbolic-link handling vulnerability in Windows Background Intelligent Transfer Service. It has CVSS 3.1 score 7.8 with a local, low-complexity vector and user interaction required. The supplied record covers numerous Windows client and server releases, including Windows 7 through 10 and Windows Server 2008 through 2019.
Likely exposure
Exposure is likely where listed Windows client or server versions remain installed without the applicable Microsoft remediation. Risk is especially relevant on endpoints where an attacker can obtain local execution or induce required user interaction. The bundle does not provide build-level fixed-version details, so patch status must be confirmed against Microsoft guidance.
Exploitation context
CISA KEV inclusion supports active exploitation in the wild. This is an elevation-of-privilege issue rather than a demonstrated remote entry point; an attacker would generally need an existing foothold and the required user interaction. The supplied sources do not describe campaign scope, exploitation frequency, or specific threat actors.
Researcher notes
The core condition is improper symbolic-link handling by BITS, mapped to CWE-59. CVSS indicates local access, low complexity, no privileges, required user interaction, unchanged scope, and high impact across all three security objectives. The bundle lacks fixed build numbers, detection signatures, exploit-chain details, and campaign telemetry; consult Microsoft for precise remediation applicability.
Mitigation direction
- Apply the applicable Microsoft security update after confirming affected Windows versions and build requirements.
- Prioritize internet-facing, privileged, shared, and high-value Windows systems in remediation scheduling.
- Retire or isolate unsupported Windows releases when Microsoft updates are unavailable.
- Use endpoint controls to reduce initial compromise and unauthorized local execution opportunities.
Validation and detection
- Inventory Windows editions, versions, architectures, installation types, and current security update levels.
- Compare each system's build and patch history with Microsoft's CVE-2020-0787 guidance.
- Confirm remediation deployment succeeded and investigate update failures or excluded systems.
- Review endpoint telemetry for suspicious privilege changes and symbolic-link-related activity around BITS.
- Document unsupported or unpatchable systems, compensating controls, ownership, and retirement dates.
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-59: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-0787 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
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/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.
CISA KEV status
SSVC decision data
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:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2020-0787 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2022-01-28T00:00:00.000Z: CVE-2020-0787 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0787CVE reference, microsoft · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0787CVE reference, CISA-ADP · government-resource
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.
Improper Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.