CVE-2017-9788

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.1EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 610 internet-exposed hosts are running an affected version right now
  • High exploitation likelihood — EPSS 57%
CISA-KEV: Not listedEPSS PROB: 57%CVSS: 9.1Exploit: Elevated riskExposed: 610

A fix is available — apply it.

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.

Live · internet exposure

610 internet-exposed hosts are running an affected version of CVE-2017-9788 right now.

across 63 countries (United States, Japan, Germany, Poland, France)top: http_server
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
68(Track*)
EG Risk 68/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation57% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
57%
EPSS %ILE
99%
KEV
Not listed

Published

July 13, 2017

Last Modified

June 17, 2026

Advisory Details (9)

Auto-updated Aug 1, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2017:2710
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:2709
redhat Patch Available
https://access.redhat.com/errata/RHSA-2017:2708
redhat Patch Available
https://access.redhat.com/errata/RHSA-2017:2483
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:2479
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2017:2478
generic
http://www.securitytracker.com/id/1038906
generic

SecurityFocus

http://www.securityfocus.com/bid/99569
generic

[SECURITY] [DSA 3913-1] apache2 security update

http://www.debian.org/security/2017/dsa-3913

Vendor Advisories for CVE-2017-9788(7)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-bin (2.4.25-3ubuntu2.2) @ zesty2026-05-22ubuntu
ubuntuapache2.2-bin (2.2.22-1ubuntu1.13) @ precise2026-05-22ubuntu
redhathttpd2017-11-16redhat
redhatmod_cluster-native-0:1.2.13-9.Final_redhat_2.ep6.el72017-11-16redhat
redhathttpd-0:2.2.15-47.el6_7.52017-11-13redhat
redhathttpd-0:2.4.6-40.el7_2.62017-11-13redhat
redhathttpd-0:2.4.6-45.el7_3.52017-11-13redhat
redhattomcat7-0:7.0.54-28_patch_05.ep6.el72017-11-02redhat
redhatpatch2017-11-02redhat
redhatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el62017-09-13redhat
redhatjbcs-httpd24-openssl-1:1.0.2h-14.jbcs.el72017-09-13redhat
redhathttpd24-httpd-0:2.4.25-9.el7.12017-08-16redhat
redhathttpd-0:2.2.15-60.el6_9.52017-08-15redhat
redhathttpd-0:2.4.6-67.el7_4.22017-08-15redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.27-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.27-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.27-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.27-1—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
apache22.2.22-13 ... 2.2.22-13+deb7u9 (10 versions)2.2.22-13+deb7u10—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
apache22.4.10-10 ... 2.4.10-10+deb8u9 (10 versions)2.4.10-10+deb8u10—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
apache22.4.25-3, 2.4.25-3+deb9u12.4.25-3+deb9u2—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 4× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-09-05 15:24 UTCEPSS rescore
  2. 2026-09-04 13:56 UTCEPSS rescore
  3. 2026-09-02 14:07 UTCEPSS rescore
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  5. 2026-08-30 19:13 UTCEPSS rescore
  6. 2026-08-30 10:00 UTCOSV refresh
  7. 2026-08-28 21:36 UTCEPSS rescore
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  16. 2026-08-14 00:29 UTCOSV refresh
  17. 2026-08-12 13:46 UTCEPSS rescore
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  23. 2026-07-30 01:26 UTCEPSS rescore
  24. 2026-07-29 04:33 UTCOSV refresh
  25. 2026-07-28 15:32 UTCEPSS rescore
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  1. 2026-07-26 14:51 UTCEPSS rescore
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  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:31 UTCEG score recompute
  5. 2026-07-22 22:11 UTCEG score recompute
  6. 2026-07-22 14:04 UTCEPSS rescore
  7. 2026-07-21 15:21 UTCEPSS rescore
  8. 2026-07-20 17:04 UTCEPSS rescore
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  17. 2026-07-12 05:43 UTCEPSS rescore
  18. 2026-07-11 21:11 UTCOSV refresh
  19. 2026-07-11 08:24 UTCEPSS rescore
  20. 2026-07-09 19:06 UTCEPSS rescore
  21. 2026-07-05 02:27 UTCEPSS rescore
  22. 2026-07-04 06:28 UTCEPSS rescore
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  24. 2026-07-01 15:03 UTCEPSS rescore
  25. 2026-06-28 04:53 UTCEPSS rescore
  26. 2026-06-28 04:53 UTCEPSS rescore
  27. 2026-06-27 03:06 UTCEPSS rescore
  28. 2026-06-25 13:47 UTCEPSS rescore
  29. 2026-06-24 14:02 UTCEPSS rescore
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  31. 2026-06-23 21:30 UTCEPSS rescore
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  33. 2026-06-23 03:30 UTCOSV refresh
  34. 2026-06-21 01:57 UTCEPSS rescore
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  36. 2026-06-19 19:23 UTCEPSS rescore
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  42. 2026-06-13 22:58 UTCEPSS rescore
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  44. 2026-06-12 23:09 UTCEPSS rescore
  45. 2026-06-12 23:09 UTCEPSS rescore
  46. 2026-06-11 13:57 UTCEPSS rescore
  47. 2026-06-10 22:15 UTCEPSS rescore
  48. 2026-06-10 13:19 UTCEPSS rescore
  49. 2026-06-06 13:45 UTCEPSS rescore
  50. 2026-06-06 13:45 UTCEPSS rescore
  51. 2026-06-06 00:23 UTCOSV refresh
  52. 2026-06-05 22:44 UTCEPSS rescore
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  54. 2026-06-05 06:08 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2017-9788?
CVE-2017-9788 is a critical vulnerability published on July 13, 2017. 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 modauthdigest. Providing an initial key with no '=' assignment could reflect the stale…
When was CVE-2017-9788 disclosed?
CVE-2017-9788 was first published in the National Vulnerability Database on July 13, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-9788 actively exploited?
CVE-2017-9788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57% probability of exploitation in the next 30 days, which ranks it in the top 1.0% of all scored CVEs.
What is the CVSS score of CVE-2017-9788?
CVE-2017-9788 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2017-9788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9788, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-9788

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