CVE-2018-17199

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: 20%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before decoding the session. This causes session expiry time to be ignored for mod_session_cookie sessions since the expiry time is loaded when the session is decoded.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
54
EG Risk 54/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
20%
EPSS %ILE
97th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

January 30, 2019

Last Modified

November 21, 2024

References (56)

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuapache2-utils (2.4.18-2ubuntu3.10) @ xenial2026-05-27ubuntu
redhathttpd:2.4-8040020210127115317.9f9e2e7e2021-05-18redhat
redhathttpd-0:2.4.6-93.el72020-03-31redhat
redhathttpd24-nghttp2-0:1.7.1-8.el72019-12-10redhat
redhatjbcs-httpd24-openssl-1:1.1.1-25.jbcs.el62019-11-20redhat
redhathttpd2019-11-20redhat
redhatjbcs-httpd24-openssl-1:1.1.1-25.jbcs.el72019-11-20redhat

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

(25 across 25 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.6(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.7(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.8(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Alpine:v3.9(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-r0: fixed in 2.4.38-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-1: fixed in 2.4.38-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-1: fixed in 2.4.38-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-1: fixed in 2.4.38-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.4.38-1: fixed in 2.4.38-1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.10-10 ... 2.4.10-10+deb8u9 (13 versions)
  • every version up to 2.4.10-10+deb8u13: fixed in 2.4.10-10+deb8u13
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
apache22.4.25-3 ... 2.4.25-3+deb9u6 (7 versions)
  • every version up to 2.4.25-3+deb9u7: fixed in 2.4.25-3+deb9u7
—

Weakness Classification(1)

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

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 25× 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 155 total refreshes for this CVE.

  1. 2026-10-09 20:02 UTCEPSS rescore
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  1. 2026-09-08 18:34 UTCOSV refresh
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  41. 2026-07-23 01:34 UTCEG score recompute
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  43. 2026-07-22 14:04 UTCEPSS rescore
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  45. 2026-07-20 23:32 UTCOSV refresh
  46. 2026-07-20 17:04 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2018-17199?
CVE-2018-17199 is a high vulnerability published on January 30, 2019. In Apache HTTP Server 2.4 release 2.4.37 and prior, modsession checks the session expiry time before decoding the session. This causes session expiry time to be ignored for modsession_cookie sessions since the expiry time is loaded when the session is decoded.
When was CVE-2018-17199 disclosed?
CVE-2018-17199 was first published on January 30, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-17199 actively exploited?
CVE-2018-17199 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-17199?
CVE-2018-17199 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-17199?
A fix for CVE-2018-17199 is available: update to the fixed version the vendor names in its advisory.

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