CVE-2021-41558Network attack vector

Privilege escalation via set_config hook bypass

Published Sep 27, 2021 · Updated Aug 4, 2024

Privilege escalation in the set_user extension module for PostgreSQL before 3.0.0 allows remote attackers to bypass ProcessUtility_hook via set_config. The REL3_0_0 release identifies set_config as bypassing ProcessUtility_hook and adds an object_access_hook to block that modification. The record does not disclose the required session privileges or a more specific post-bypass consequence beyond unauthorized utility-hook bypass.

CVSS severity9.8
Critical
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in the set_user extension module for PostgreSQL before 3.0.0 allows remote attackers to bypass ProcessUtility_hook via set_config. The REL3_0_0 release identifies set_config as bypassing ProcessUtility_hook and adds an object_access_hook to block that modification. The record does not disclose the required session privileges or a more specific post-bypass consequence beyond unauthorized utility-hook bypass.

The record

CVE
CVE-2021-41558
Published
Sep 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE 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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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