CVE-2018-17199: apache software foundation apache http server Session Fixation
Vulnerability summary
CVE-2018-17199 is a high (CVSS 7.5) Session Fixation vulnerability in apache software foundation apache http server. EPSS estimates a 20.16% chance of exploitation in the next 30 days, higher than 97.4% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 20% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 14 · Related 7Timeline
- 30-01-2019PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
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 metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
20.16%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 20.16% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- apache2< 2.4.10-10+deb8u13 | < 2.4.38-1
- debian_linuxEOL8.0 | 9.0
Netapp2 products
Alpine1 product
- apache2< 2.4.38-r0
Apache1 product
- http_server≥ 2.4.0, ≤ 2.4.37
Apache software foundation1 product
- apache http serverApache HTTP Server 2.4.0 to 2.4.37
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Oracle1 product
Ubuntu1 product
- apache2< 2.4.7-1ubuntu4.22 | < 2.4.18-2ubuntu3.10 | < 2.4.29-1ubuntu4.6
8 vendors · 10 products
References
34 links
lists.debian.org/debian-lts-announce/2019/01/msg00024.htmlMailing ListX Refsource MLISTThird Party Advisory- www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlX Refsource MISCPatchThird Party Advisory
Show all 34 references
- www.tenable.com/security/tns-2019-09X Refsource CONFIRM