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Fencer Vulns
medium 4.4

CVE-2020-21469 json

An issue was discovered in PostgreSQL 12.2 allows attackers to cause a denial of service via repeatedly sending SIGHUP signals.

published 2023-08-22 3 y ago modified 2026-09-08 2 mo ago also BIT-postgresql-2020-21469 , EUVD-2020-14241

cvss
4.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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).

Patch / fix

  • bitnami postgresql 12.2.1
  • postgresql-12 Ubuntu 20.04 LTS 12.5-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-21469

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-21469 updated cvss 4.4

postgresql: Stack buffer overflow when continuously send SIGHUP

  • Red Hat Enterprise Linux 6 postgresql, postgresql-libs, postgresql-test, postgresql-pltcl, postgresql-plperl, postgresql-server, +2 more Red Hat Enterprise Linux 7 postgresql, postgresql-libs, postgresql-test, postgresql-pltcl, postgresql-plperl, postgresql-server, +3 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 pgaudit, pg_repack, postgresql, postgresql-test, postgresql-pltcl, postgresql-plperl, +7 more Red Hat Software Collections rh-postgresql10-postgresql, rh-postgresql12-postgresql, rh-postgresql10-postgresql-libs, rh-postgresql10-postgresql-test, rh-postgresql12-postgresql-libs, rh-postgresql12-postgresql-test, +16 more
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 pgaudit, pg_repack, postgresql, postgresql-test, postgresql-pltcl, postgresql-plperl, +7 more Red Hat Enterprise Linux 9 postgresql, postgresql-test, postgresql-pltcl, postgresql-plperl, postgresql-server, postgresql-contrib, +4 more Red Hat Software Collections rh-postgresql13-postgresql, rh-postgresql13-postgresql-libs, rh-postgresql13-postgresql-test, rh-postgresql13-postgresql-pltcl, rh-postgresql13-postgresql-plperl, rh-postgresql13-postgresql-server, +6 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • postgresql.org https://www.postgresql.org/message-id/CAA8ZSMqAHDCgo07hqKoM5XJaoQy6Vv76O7966agez4ffyQktkA%40mail.gmail.com referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami postgresql
>=12.2.0, <12.2.1
12.2.1

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.