CVE-2018-18506: canonical ubuntu_linux
Vulnerability summary
CVE-2018-18506 is a medium (CVSS 5.9) vulnerability in canonical ubuntu_linux. EPSS estimates a 2.20% chance of exploitation in the next 30 days, higher than 82.5% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 22 · Related 10Timeline
- 05-02-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this PAC file can specify that requests to the localhost are to be sent through the proxy to another server. This behavior is disallowed by default when a proxy is manually configured, but when enabled could allow for attacks on services and tools that bind to the localhost for networked behavior if they are accessed through browsing. This vulnerability affects Firefox < 65.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · AlpineEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
2.20%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.20% 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 causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat8 products
- enterprise_linux8.0
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_eus8.1 | 8.2 | 8.4 | 8.6
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6 | 8.2 | 8.4 | 8.6
Ubuntu4 products
- firefox< 65.0+build2-0ubuntu0.14.04.1 | < 65.0+build2-0ubuntu0.16.04.1 | < 65.0+build2-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- thunderbird< 1:60.6.1+build2-0ubuntu0.14.04.1 | < 1:60.6.1+build2-0ubuntu0.16.04.1 | < 1:60.6.1+build2-0ubuntu0.18.04.1
Debian3 products
- firefox-esr< 60.6.0esr-1
- thunderbird< 1:60.6.1-1
- debian_linuxEOL8.0 | 9.0
Alpine1 product
- firefox-esr< 60.6.1-r0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
Mozilla1 product
- firefox≥ unspecified, < 65 | < 65.0
Opensuse1 product
- leapEOL15.0 | 42.3
7 vendors · 19 products
References
29 links
- lists.debian.org/debian-lts-announce/2019/03/msg00024.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00035.htmlVendor AdvisoryX Refsource SUSEBroken LinkMailing ListThird Party Advisory
Show all 29 references
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00043.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2019/04/msg00000.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00023.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00043.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory