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NVD / CVE Program· CNA microsoft

CVE-2020-0638: An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an at

Noroxi assessment

Priority: This week (action score 62/100)

  • CISA has confirmed exploitation in the wild (May 23, 2022); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Jun 13, 2022.
  • Probability of exploitation in the next 30 days: 2.3% (FIRST EPSS); higher than 83.7% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Don’t wait for the next maintenance window. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

An elevation of privilege vulnerability exists in the way the Update Notification Manager handles files.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Update Notification Manager Elevation of Privilege Vulnerability'.

HighCVSS 7.8 · v3.1KEVWeaponized No fix recorded
Published
Jan 14, 2020
Updated
Aug 12, 2026
EPSS
2.3% · 83th percentile

Report tools

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Action score

62

This week

Don’t wait for the next maintenance window.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 2.3%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on May 23, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Jun 13, 2022.

Known to be used in ransomware campaigns.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftwindows 10 1709
microsoftwindows 10 1803
microsoftwindows 10 1809
microsoftwindows 10 1903
microsoftwindows 10 1909
microsoftwindows server 1803
microsoftwindows server 1903
microsoftwindows server 1909
microsoftwindows server 2019

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 1803all versions
  • microsoft windows server 1903all versions
  • microsoft windows server 1909all versions
  • microsoft windows server 2019all versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows

    • 10 Version 1709 for 32-bit Systems, 10 Version 1803 for 32-bit Systems, 10 Version 1809 for ARM64-based Systems, 10 Version 1803 for x64-based Systems, 10 Version 1709 for ARM64-based Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for ARM64-based Systems, 10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systemsaffected

  • Microsoft Windows 10 Version 1903 for 32-bit Systems

    • unspecifiedaffected

  • Microsoft Windows 10 Version 1903 for ARM64-based Systems

    • unspecifiedaffected

  • Microsoft Windows 10 Version 1903 for x64-based Systems

    • unspecifiedaffected

  • Microsoft Windows 10 Version 1909 for 32-bit Systems

    • unspecifiedaffected

  • Microsoft Windows 10 Version 1909 for ARM64-based Systems

    • unspecifiedaffected

  • Microsoft Windows 10 Version 1909 for x64-based Systems

    • unspecifiedaffected

  • Microsoft Windows Server

    • 2019, 2019 (Core installation), version 1803 (Core Installation)affected

  • Microsoft Windows Server, version 1903 (Server Core installation)

    • unspecifiedaffected

  • Microsoft Windows Server, version 1909 (Server Core installation)

    • unspecifiedaffected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-1385An elevation of privilege vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resultiKEV
    62This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+859 d
  3. TodayOct 27, 2026+2478 d
EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records