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PostgreSQL CVE-2017-7546

CRITICAL
Improper Authentication (CWE-287)
2017-08-16 secalert@redhat.com
Authentication Bypass PostgreSQL Debian Debian Linux
9.8
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-287
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 33.12%.
Exploit ScenarioDerived

A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.
No patch listed yet 33.1% exploitation probability (EPSS)

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AnalysisAI

PostgreSQL versions before 9.2.22, 9.3.18, 9.4.13, 9.5.8 and 9.6.4 are vulnerable to incorrect authentication flaw allowing remote attackers to gain access to database accounts with an empty password. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 33.1% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. PostgreSQL versions before 9.2.22, 9.3.18, 9.4.13, 9.5.8 and 9.6.4 are vulnerable to incorrect authentication flaw allowing remote attackers to gain access to database accounts with an empty password. Affected products include: Postgresql, Debian Debian Linux. Version information: before 9.2.22.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

PostgreSQL versions before 9.2.22, 9.3.18, 9.4.13, 9.5.8 and 9.6.4 are vulnerable to incorrect authentication flaw allowing remote attackers to gain access to database accounts with an empty password.

Threat Intelligence Overview

EPSS Score
33.1%
Top 3% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 33.1%
Patch available No
Active threat No
Deciding rule
CRITICAL + EPSS > 30%, no patch available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

82
Low Medium High Critical
KEV: 0
EPSS: +33
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:postgresql:postgresql:9.2:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.1:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.2:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.3:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.4:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.5:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.6:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.7:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.8:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.9:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.10:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.11:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.12:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.13:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.14:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.15:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.16:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.17:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.18:*:*:*:*:*:*:*
cpe:2.3:a:postgresql:postgresql:9.2.19:*:*:*:*:*:*:*
+ 46 more

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References

Advisories & patches
ADVISORY https://www.postgresql.org/about/news/1772/ REF http://www.debian.org/security/2017/dsa-3935 REF http://www.debian.org/security/2017/dsa-3936 REF http://www.securityfocus.com/bid/100278 REF http://www.securitytracker.com/id/1039142 REF https://access.redhat.com/errata/RHSA-2017:2677 REF https://access.redhat.com/errata/RHSA-2017:2678 REF https://access.redhat.com/errata/RHSA-2017:2728 REF https://access.redhat.com/errata/RHSA-2017:2860 REF https://security.gentoo.org/glsa/201710-06

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