What is the CVSS score of CVE-2017-9788?

CVE-2017-9788 has a CVSS 3.0 base score of 9.1 (Critical). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. EPSS exploitation probability: 49.5%.

Is there a patch available for CVE-2017-9788?

Yes, a patch is available for CVE-2017-9788. Update the affected software to the latest version immediately.

Debian Linux CVE-2017-9788

CRITICAL

Improper Input Validation (CWE-20)

2017-07-13 security@apache.org

Denial Of Service Apache Apple Debian Oracle Red Hat Debian Linux Enterprise Linux Desktop Enterprise Linux Server Enterprise Linux Server Aus Enterprise Linux Server Tus Enterprise Linux Workstation Http Server Jboss Core Services Jboss Enterprise Application Platform Oncommand Unified Manager Mac Os X Secure Global Desktop Enterprise Linux Server Eus Jboss Enterprise Web Server Storage Automation Store Apache HTTP Server Netapp

9.1

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-20 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V2 - Validation and Business Logic Input validation, allowlisting
Impact	CVSS score of 9.1 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 49.50%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

Patch available 49.5% exploitation probability (EPSS)

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AnalysisAI

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 49.5%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service. Affected products include: Apache Http Server, Debian Debian Linux, Apple Mac Os X, Netapp Oncommand Unified Manager, Netapp Storage Automation Store. Version information: before 2.2.34.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.1 CRITICAL

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

None

Availability

High

DescriptionCVE.org

In Apache httpd before 2.2.34 and 2.4.x before 2.4.27, the value placeholder in [Proxy-]Authorization headers of type 'Digest' was not initialized or reset before or between successive key=value assignments by mod_auth_digest. Providing an initial key with no '=' assignment could reflect the stale value of uninitialized pool memory used by the prior request, leading to leakage of potentially confidential information, and a segfault in other cases resulting in denial of service.

Threat Intelligence Overview

EPSS Score

49.5%

Top 2% 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 49.5%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity

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

Low Medium High Critical

KEV: 0

EPSS: +49

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

cpe:2.3:a:netapp:oncommand_unified_manager:-:*:*:*:*:7-mode:*:*

cpe:2.3:a:netapp:storage_automation_store:-:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:6.7:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:7.2:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*

cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*

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