CVE-2021-42797Network attack vector

Windows token disclosure via UNC path injection

Published Dec 16, 2023 · Updated Aug 4, 2024

UNC path injection in AVEVA Edge 2020 R2 SP1 and earlier allows remote attackers to disclose a configured account's Windows access token. The Edge runtime follows an attacker-controlled Windows UNC path without restricting the target share, exposing the token used for external database access. The Database Gateway is reachable on configurable TCP port 3997 by default; no authentication or user interaction is required.

CVSS severity8.6
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

UNC path injection in AVEVA Edge 2020 R2 SP1 and earlier allows remote attackers to disclose a configured account's Windows access token. The Edge runtime follows an attacker-controlled Windows UNC path without restricting the target share, exposing the token used for external database access. The Database Gateway is reachable on configurable TCP port 3997 by default; no authentication or user interaction is required.

The record

CVE
CVE-2021-42797
Published
Dec 16, 2023
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-40, T1134.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6AVEVACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-40Path Traversal: '\\UNC\share\name\' (Windows UNC Share)
T1134.001Token Impersonation/Theft

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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