CVE-2022-40299Public exploit

Local privilege escalation via predictable temporary paths

Published Sep 9, 2022 · Updated Aug 3, 2024

Improper temporary-file handling in Singular before 4.3.1 allows local users to gain another user's privileges through /tmp. The sdb_edit function derives /tmp/sd from its process ID and opens it non-atomically, allowing a local user to pre-create the path or redirect it with a symbolic link. Access to the same host is required; invoking the affected interface under a more privileged account exposes that account's file access and procedure-processing privileges.

CVSS severity7.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper temporary-file handling in Singular before 4.3.1 allows local users to gain another user's privileges through /tmp. The sdb_edit function derives /tmp/sd from its process ID and opens it non-atomically, allowing a local user to pre-create the path or redirect it with a symbolic link. Access to the same host is required; invoking the affected interface under a more privileged account exposes that account's file access and procedure-processing privileges.

The record

CVE
CVE-2022-40299
Published
Sep 9, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1068Exploitation for Privilege Escalation

Public exploit references

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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