CVE-2006-5540 [Medium] | Denial of Service in Postgresql

backend/parser/analyze.c in PostgreSQL 8.1.x before 8.1.5 allows remote authenticated users to cause a denial of service (daemon crash) via certain aggregate functions in an UPDATE statement, which are not properly handled during a "MIN/MAX index optimization."

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	2.10%	1.86%	-0.24%
2	2025-11-19	1.56%	2.10%	+0.55%
3	2025-03-30	—	1.56%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

2.10%

1.86%

-0.24%

2025-11-19

1.56%

2.10%

+0.55%

2025-03-30

—

1.56%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.0	2.0	MEDIUM	`AV:N/AC:L/Au:S/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.0

2.0

MEDIUM

AV:N/AC:L/Au:S/C:N/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.0

2.9

[email protected]

OS Trackers for CVE-2006-5540

vendor	priority	summary	link
`alpine`	—	CVE-2006-5540: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0.	https://security.alpinelinux.org/vuln/CVE-2006-5540
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2006-5540
`ubuntu`	medium	CVE-2006-5540 medium priority: Ubuntu including 3 source packages (postgresql-7.4, postgresql-8.0, postgresql-8.1), 12 status rows across 4 suites (dapper, edgy, feisty, upstream): DNE 3, needs-triage 3, not-affected 3, released 3.	https://ubuntu.com/security/CVE-2006-5540

Affected software / configurations for CVE-2006-5540

Vendor	Product	Version	Raw CPE
postgresql	postgresql	6.3.2	cpe:2.3:a:postgresql:postgresql:6.3.2:::::::*
postgresql	postgresql	6.5.3	cpe:2.3:a:postgresql:postgresql:6.5.3:::::::*
postgresql	postgresql	7.0.2	cpe:2.3:a:postgresql:postgresql:7.0.2:::::::*
postgresql	postgresql	7.0.3	cpe:2.3:a:postgresql:postgresql:7.0.3:::::::*
postgresql	postgresql	7.1	cpe:2.3:a:postgresql:postgresql:7.1:::::::*
postgresql	postgresql	7.1.1	cpe:2.3:a:postgresql:postgresql:7.1.1:::::::*
postgresql	postgresql	7.1.2	cpe:2.3:a:postgresql:postgresql:7.1.2:::::::*
postgresql	postgresql	7.1.3	cpe:2.3:a:postgresql:postgresql:7.1.3:::::::*
postgresql	postgresql	7.2	cpe:2.3:a:postgresql:postgresql:7.2:::::::*
postgresql	postgresql	7.2.1	cpe:2.3:a:postgresql:postgresql:7.2.1:::::::*
postgresql	postgresql	7.2.2	cpe:2.3:a:postgresql:postgresql:7.2.2:::::::*
postgresql	postgresql	7.2.3	cpe:2.3:a:postgresql:postgresql:7.2.3:::::::*
postgresql	postgresql	7.2.4	cpe:2.3:a:postgresql:postgresql:7.2.4:::::::*
postgresql	postgresql	7.2.7	cpe:2.3:a:postgresql:postgresql:7.2.7:::::::*
postgresql	postgresql	7.3	cpe:2.3:a:postgresql:postgresql:7.3:::::::*
postgresql	postgresql	7.3.1	cpe:2.3:a:postgresql:postgresql:7.3.1:::::::*
postgresql	postgresql	7.3.2	cpe:2.3:a:postgresql:postgresql:7.3.2:::::::*
postgresql	postgresql	7.3.3	cpe:2.3:a:postgresql:postgresql:7.3.3:::::::*
postgresql	postgresql	7.3.4	cpe:2.3:a:postgresql:postgresql:7.3.4:::::::*
postgresql	postgresql	7.3.6	cpe:2.3:a:postgresql:postgresql:7.3.6:::::::*
postgresql	postgresql	7.3.8	cpe:2.3:a:postgresql:postgresql:7.3.8:::::::*
postgresql	postgresql	7.3.9	cpe:2.3:a:postgresql:postgresql:7.3.9:::::::*
postgresql	postgresql	7.3.10	cpe:2.3:a:postgresql:postgresql:7.3.10:::::::*
postgresql	postgresql	7.3.11	cpe:2.3:a:postgresql:postgresql:7.3.11:::::::*
postgresql	postgresql	7.3.12	cpe:2.3:a:postgresql:postgresql:7.3.12:::::::*
postgresql	postgresql	7.3.13	cpe:2.3:a:postgresql:postgresql:7.3.13:::::::*
postgresql	postgresql	7.3.14	cpe:2.3:a:postgresql:postgresql:7.3.14:::::::*
postgresql	postgresql	7.3.15	cpe:2.3:a:postgresql:postgresql:7.3.15:::::::*
postgresql	postgresql	7.4	cpe:2.3:a:postgresql:postgresql:7.4:::::::*
postgresql	postgresql	7.4.1	cpe:2.3:a:postgresql:postgresql:7.4.1:::::::*
postgresql	postgresql	7.4.2	cpe:2.3:a:postgresql:postgresql:7.4.2:::::::*
postgresql	postgresql	7.4.3	cpe:2.3:a:postgresql:postgresql:7.4.3:::::::*
postgresql	postgresql	7.4.4	cpe:2.3:a:postgresql:postgresql:7.4.4:::::::*
postgresql	postgresql	7.4.5	cpe:2.3:a:postgresql:postgresql:7.4.5:::::::*
postgresql	postgresql	7.4.6	cpe:2.3:a:postgresql:postgresql:7.4.6:::::::*
postgresql	postgresql	7.4.7	cpe:2.3:a:postgresql:postgresql:7.4.7:::::::*
postgresql	postgresql	7.4.8	cpe:2.3:a:postgresql:postgresql:7.4.8:::::::*
postgresql	postgresql	7.4.9	cpe:2.3:a:postgresql:postgresql:7.4.9:::::::*
postgresql	postgresql	7.4.10	cpe:2.3:a:postgresql:postgresql:7.4.10:::::::*
postgresql	postgresql	7.4.11	cpe:2.3:a:postgresql:postgresql:7.4.11:::::::*
postgresql	postgresql	7.4.12	cpe:2.3:a:postgresql:postgresql:7.4.12:::::::*
postgresql	postgresql	7.4.13	cpe:2.3:a:postgresql:postgresql:7.4.13:::::::*
postgresql	postgresql	8.0	cpe:2.3:a:postgresql:postgresql:8.0:::::::*
postgresql	postgresql	8.0.1	cpe:2.3:a:postgresql:postgresql:8.0.1:::::::*
postgresql	postgresql	8.0.2	cpe:2.3:a:postgresql:postgresql:8.0.2:::::::*
postgresql	postgresql	8.0.3	cpe:2.3:a:postgresql:postgresql:8.0.3:::::::*
postgresql	postgresql	8.0.4	cpe:2.3:a:postgresql:postgresql:8.0.4:::::::*
postgresql	postgresql	8.0.5	cpe:2.3:a:postgresql:postgresql:8.0.5:::::::*
postgresql	postgresql	8.0.6	cpe:2.3:a:postgresql:postgresql:8.0.6:::::::*
postgresql	postgresql	8.0.7	cpe:2.3:a:postgresql:postgresql:8.0.7:::::::*
postgresql	postgresql	8.0.8	cpe:2.3:a:postgresql:postgresql:8.0.8:::::::*
postgresql	postgresql	8.1	cpe:2.3:a:postgresql:postgresql:8.1:::::::*
postgresql	postgresql	8.1.1	cpe:2.3:a:postgresql:postgresql:8.1.1:::::::*
postgresql	postgresql	8.1.2	cpe:2.3:a:postgresql:postgresql:8.1.2:::::::*
postgresql	postgresql	8.1.3	cpe:2.3:a:postgresql:postgresql:8.1.3:::::::*
postgresql	postgresql	8.1.4	cpe:2.3:a:postgresql:postgresql:8.1.4:::::::*

References for CVE-2006-5540

URL	Tags
ftp://patches.sgi.com/support/free/security/advisories/20070201-01-P.asc
http://projects.commandprompt.com/public/pgsql/changeset/25504
http://secunia.com/advisories/22562	Patch Vendor Advisory
http://secunia.com/advisories/22584	Patch Vendor Advisory
http://secunia.com/advisories/22606
http://secunia.com/advisories/22636
http://secunia.com/advisories/23048
http://secunia.com/advisories/23132
http://secunia.com/advisories/24094
http://secunia.com/advisories/24284
http://secunia.com/advisories/24577
http://securitytracker.com/id?1017115
http://support.avaya.com/elmodocs2/security/ASA-2007-117.htm
http://support.novell.com/techcenter/psdb/59650c03a8bc5ae310cd7898bd106ad2.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:194
http://www.novell.com/linux/security/advisories/2006_27_sr.html
http://www.postgresql.org/about/news.664
http://www.redhat.com/support/errata/RHSA-2007-0064.html
http://www.redhat.com/support/errata/RHSA-2007-0067.html
http://www.redhat.com/support/errata/RHSA-2007-0068.html
http://www.securityfocus.com/bid/20717	Patch
http://www.trustix.org/errata/2006/0059/
http://www.ubuntu.com/usn/usn-369-1
http://www.ubuntu.com/usn/usn-369-2
http://www.vupen.com/english/advisories/2006/4182
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11425

URL

CVE-2006-5540

Exploit prediction scoring system (EPSS) score for CVE-2006-5540

Common vulnerability scoring system (CVSS) metrics for CVE-2006-5540

Weakness enumeration for CVE-2006-5540

OS Trackers for CVE-2006-5540

Affected software / configurations for CVE-2006-5540

References for CVE-2006-5540