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No exploitation reportedFix available

CVE-2017-9788

No exploitation reported by the sources we read.

  • Published2017-07-13
  • WeaknessCWE-20 · CWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2017-07-1316:29CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9788?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9788?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux server eus
BranchAffectedFixed in
6.7= 6.7no fix published
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.5= 7.5no fix published
7.6= 7.6no fix published
Redhat enterprise linux server aus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.6= 7.6no fix published
Redhat enterprise linux server tus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.6= 7.6no fix published

12 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • RHSA-2017:3240 Red Hat Product Security81 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 6.4.18 security update

  • RHSA-2017:3239 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 6.4.18 security update

  • RHSA-2017:3113 Red Hat Product Security99 products fixed

    Red Hat Security Advisory: Red Hat JBoss Web Server security and bug fix update

  • RHSA-2017:3114 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Web Server security and bug fix update

  • RHSA-2017:2710 Red Hat Product Security35 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services security update

  • RHSA-2017:2709 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services security update

1 more advisory

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2017:3240 · 81 productsBefore applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After instal…
  2. Vendor fix Red Hat Product Security RHSA-2017:3239 · 1 productBefore applying this update, back up your existing Red Hat JBoss Enterprise Application Platform installation and deployed applications. The References section of this erratum contains a download link (you must log in to download the update). The JBoss server process must be restarted for the upd…
  3. Vendor fix Red Hat Product Security RHSA-2017:3113 · 99 productsBefore applying the update, back up your existing Red Hat JBoss Web Server installation (including all applications and configuration files). For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 For the…
  4. Vendor fix Red Hat Product Security RHSA-2017:3114 · 1 productBefore applying the update, back up your existing Red Hat JBoss Web Server installation (including all applications and configuration files). The References section of this erratum contains a download link (you must log in to download the update).
  5. Vendor fix Red Hat Product Security RHSA-2017:2710 · 35 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically. For the update to take effect, all services linked to the Ope…
  6. Vendor fix Red Hat Product Security RHSA-2017:2708 · 1 productFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.09.1read 2026-10-23
  • NVDCVSS 2.06.4read 2026-10-23
  • NVDweakness (CWE)CWE-20, CWE-200read 2026-10-23
  • FIRST EPSSEPSS score56.8 %read 2026-10-23

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
2017-07-13
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2017-9788?

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.

Is CVE-2017-9788 actively exploited?

Active exploitation of CVE-2017-9788 has not been confirmed. Its EPSS score was 56.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

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

CVE-2017-9788 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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