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Vulnerability record · CVE-2020-21469 · published 22 August 2023

CVE-2020-21469: Postgresql classic buffer overflow vulnerability

Postgresql · Postgresql

An issue was discovered in PostgreSQL 12.2 allows attackers to cause a denial of service via repeatedly sending SIGHUP signals. NOTE: this is disputed by the vendor because untrusted users cannot send SIGHUP signals; they can only be sent by a PostgreSQL superuser, a user with pg_reload_conf access, or a user with sufficient privileges at the OS level (the postgres account or the root account).

4.4 CVSS 3.1 Medium EPSS 0.37% · top 71.9% CWE-120 · Classic buffer overflow
4.4CVSS 3.1 base score
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in PostgreSQL 12.2 allows attackers to cause a denial of service via repeatedly sending SIGHUP signals. NOTE: this is disputed by the vendor because untrusted users cannot send SIGHUP signals; they can only be sent by a PostgreSQL superuser, a user with pg_reload_conf access, or a user with sufficient privileges at the OS level (the postgres account or the root account).

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.postgresql.org/message-id/CAA8ZSMqAHDCgo07hqKoM5XJaoQy6Vv76O7966agez4ffyQktkA%40mail.gmail.com ExploitMailing ListVendor Advisory
https://www.postgresql.org/message-id/flat/CAA8ZSMqAHDCgo07hqKoM5XJaoQy6Vv76O7966agez4ffyQktkA%40mail.gmail.com Mailing List
https://www.postgresql.org/support/security/ Product
https://www.postgresql.org/message-id/CAA8ZSMqAHDCgo07hqKoM5XJaoQy6Vv76O7966agez4ffyQktkA%40mail.gmail.com ExploitMailing ListVendor Advisory
https://www.postgresql.org/message-id/flat/CAA8ZSMqAHDCgo07hqKoM5XJaoQy6Vv76O7966agez4ffyQktkA%40mail.gmail.com Mailing List
https://www.postgresql.org/support/security/ Product

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Source: NIST National Vulnerability Database (record CVE-2020-21469), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.