CVE & CISA-KEV Catalog

CVE-2017-9788

CRITICALEPSS 99th pctl
9.1
CVSS v3
NVD

Description

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.

CWE-20Improper Input ValidationCWE-200Information Exposure

How to fix

Remediation Available
apache2Debian
Fixed in:2.4.27-1CVE-2017-9788
Fixed in:2.4.27-1CVE-2017-9788
Fixed in:2.4.27-1CVE-2017-9788
Fixed in:2.4.27-1CVE-2017-9788
apache2Ubuntu
Fixed in:2.4.7-1ubuntu4.17USN-3370-1
Fixed in:2.4.18-2ubuntu3.4USN-3370-1
apache2-binUbuntu
Fixed in:2.4.7-1ubuntu4.17USN-3370-1
Fixed in:2.4.18-2ubuntu3.4USN-3370-1

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Exploit Intelligence

56.77%probability of exploitation in 30 days
99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-3400Critical10.0100%KEV + Ransom-
CVE-2021-45105Medium5.9100%-Fix
CVE-2021-44228Critical10.0100%KEV + RansomFix
CVE-2021-21985Critical9.8100%KEV + RansomFix
CVE-2018-7600Critical9.8100%KEV + RansomFix
CVE-2020-3452High7.5100%KEVFix
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.