CVE-2016-2161

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 21%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to mod_auth_digest can cause the server to crash, and each instance continues to crash even for subsequently valid requests.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
21%
EPSS %ILE
97%
KEV
Not listed

Published

July 27, 2017

Last Modified

June 17, 2026

References (54)

Vendor Advisories for CVE-2016-2161(3)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-bin (2.4.18-2ubuntu4.1) @ yakkety2026-05-22ubuntu
redhatjbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el62017-06-07redhat
redhatjbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el72017-06-07redhat
redhatpatch2017-06-07redhat
redhathttpd24-httpd-0:2.4.25-9.el72017-04-26redhat
redhathttpd-0:2.4.6-45.el7_3.42017-04-12redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.25-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.25-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.25-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache2—2.4.25-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
apache22.4.10-10 ... 2.4.10-10+deb8u7 (8 versions)2.4.10-10+deb8u8—

Weakness Classification(2)

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

Additional Vendor Advisories

(3)

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 6× in last 7d / 23× 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 113 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
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  7. 2026-08-13 23:39 UTCOSV refresh
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  23. 2026-07-23 01:22 UTCEG score recompute
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  25. 2026-07-22 14:04 UTCEPSS rescore
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  1. 2026-07-21 15:21 UTCEPSS rescore
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  19. 2026-07-11 20:11 UTCOSV refresh
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  23. 2026-07-07 13:42 UTCEPSS rescore
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  39. 2026-06-23 02:30 UTCOSV refresh
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  43. 2026-06-18 17:50 UTCEPSS rescore
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  49. 2026-06-14 23:14 UTCEPSS rescore
  50. 2026-06-12 23:09 UTCEPSS rescore
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  58. 2026-06-05 22:53 UTCOSV refresh
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  75. 2026-05-24 16:43 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-2161?
CVE-2016-2161 is a high vulnerability published on July 27, 2017. In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to modauthdigest can cause the server to crash, and each instance continues to crash even for subsequently valid requests.
When was CVE-2016-2161 disclosed?
CVE-2016-2161 was first published in the National Vulnerability Database on July 27, 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-2016-2161 actively exploited?
CVE-2016-2161 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 21% probability of exploitation in the next 30 days, which ranks it in the top 2.6% of all scored CVEs.
What is the CVSS score of CVE-2016-2161?
CVE-2016-2161 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2016-2161?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2161, 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.

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