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ExploitedNot in CISA KEV yetFix available

CVE-2018-11759

Exploitation confirmed. First attested on 2023-12-19 by GCVE · kevintel, GCVE · shadowserver.

  • Published2018-10-31
  • WeaknessCWE-22

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

The Apache Web Server (httpd) specific code that normalised the requested path before matching it to the URI-worker map in Apache Tomcat JK (mod_jk) Connector 1.2.0 to 1.2.44 did not handle some edge cases correctly. If only a sub-set of the URLs supported by Tomcat were exposed via httpd, then it was possible for a specially constructed request to expose application functionality through the reverse proxy that was not intended for clients accessing the application via the reverse proxy. It was also possible in some configurations for a specially constructed request to bypass the access controls configured in httpd. While there is some overlap between this issue and CVE-2018-1323, they are not identical.

Timeline

dates in UTC
  1. 2018-10-3120:29CVE publishedNVD
  2. 2023-12-1900:01Listed as exploited by GCVEGCVE
  3. 2023-12-1900:01Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 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-2018-11759?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-11759?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
9.0= 9.0no fix published
Apache tomcat jk connector
BranchAffectedFixed in
1.2≥ 1.2.0, ≤ 1.2.44no fix published
Redhat jboss core services
BranchAffectedFixed in
—all versionsno fix published

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.

Packages

  • apache2-mod_jkSUSE:Linux Enterprise Server for SAP Applications 12 SP4all versions · fixed in 1.2.40-7.3.1
  • apache2-mod_jkSUSE:Linux Enterprise Server for SAP Applications 11 SP4all versions · fixed in 1.2.40-0.2.5.1
  • apache2-mod_jkSUSE:Linux Enterprise Server 12 SP4all versions · fixed in 1.2.40-7.3.1
  • apache2-mod_jkSUSE:Linux Enterprise Server 11 SP4all versions · fixed in 1.2.40-0.2.5.1
  • apache2-mod_jkSUSE:Linux Enterprise Module for Server Applications 15 SP5all versions · fixed in 1.2.49-150100.6.6.1
  • apache2-mod_jkSUSE:Linux Enterprise Module for Server Applications 15 SP4all versions · fixed in 1.2.49-150100.6.6.1
  • apache2-mod_jkSUSE:Linux Enterprise Module for Server Applications 15all versions · fixed in 1.2.43-3.3.1
  • apache2-mod_jkopenSUSE:Tumbleweedall versions · fixed in 1.2.48-2.9

27 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-11759 Red Hat Product Security139 products fixed · 3 known affected

    mod_jk: connector path traversal due to mishandled HTTP requests in httpd

    mod_jk as a component of Red Hat JBoss Enterprise Application Platform 5 · mod_jk as a component of Red Hat JBoss Enterprise Application Platform 6 · mod_jk as a component of Red Hat JBoss Enterprise Web Server 2

  • RHSA-2019:0367 Red Hat Product Security138 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 security update

  • RHSA-2019:0366 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP1 security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:0367 · 138 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.
  2. Vendor fix Red Hat Product Security RHSA-2019:0366 · 1 productThe References section of this erratum contains a download link (you must log in to download the update). Before applying the update, back up your existing Red Hat JBoss Core Services installation (including all applications and configuration files).
  3. No fix available, says the vendor Red Hat Product Security CVE-2018-11759 · 1 productAffected
  4. No fix planned, says the vendor Red Hat Product Security CVE-2018-11759 · 2 productsWill not fix

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedimmunIT/CVE-2018-11759Jul10l1r4/Identificador-CVE-2018-11759julioliraup/Identificador-CVE-2018-11759
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2018-10-31
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-11759?

The Apache Web Server (httpd) specific code that normalised the requested path before matching it to the URI-worker map in Apache Tomcat JK (mod_jk) Connector 1.2.0 to 1.2.44 did not handle some edge cases correctly. If only a sub-set of the URLs supported by Tomcat were exposed via httpd, then it was possible for a specially constructed request to expose application functionality through the reverse proxy that was not intended for clients accessing the application via the reverse proxy. It was also possible in some configurations for a specially constructed request to bypass the access controls configured in httpd. While there is some overlap between this issue and CVE-2018-1323, they are not identical.

Is CVE-2018-11759 actively exploited?

Active exploitation of CVE-2018-11759 has not been confirmed. Its EPSS score was 90.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-11759?

CVE-2018-11759 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Same product first, then the same vendor advisory and the same publication week.

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Sources for this record