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CVE-2018-18506· NVD / CVE Program· CNA mozilla

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

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.1% (FIRST EPSS); higher than 82% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: firefox-esr (Debian:12) 60.6.0esr-1; thunderbird (Debian:12) 1:60.6.1-1; firefox-esr (Debian:8) 60.6.0esr-1~deb8u1.

Low priority for now. Upgrade to firefox-esr (Debian:12) 60.6.0esr-1; thunderbird (Debian:12) 1:60.6.1-1; firefox-esr (Debian:8) 60.6.0esr-1~deb8u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Feb 5, 2019
Updated
Jun 16, 2026
EPSS
2.2% · 82th percentile
CWE
—

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
canonicalubuntu linux
debiandebian linux
redhatenterprise linux
redhatenterprise linux desktop
redhatenterprise linux eus
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux server tus
redhatenterprise linux workstation
opensuseleap

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • debian debian linux8.0
  • debian debian linux9.0
  • mozilla firefoxbefore 65.0
  • opensuse leap15.0
  • opensuse leap42.3
  • redhat enterprise linux8.0
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux eus8.1
  • redhat enterprise linux eus8.2
  • redhat enterprise linux eus8.4
  • redhat enterprise linux eus8.6
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.6
  • redhat enterprise linux server aus8.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 65affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12firefox-esrbefore 60.6.0esr-160.6.0esr-1
Debian:12thunderbirdbefore 1:60.6.1-11:60.6.1-1
Debian:8firefox-esrbefore 60.6.0esr-1~deb8u160.6.0esr-1~deb8u1
Debian:8thunderbirdbefore 1:60.6.1-1~deb8u11:60.6.1-1~deb8u1
Debian:9firefox-esrbefore 60.6.0esr-1~deb9u160.6.0esr-1~deb9u1
Debian:9thunderbirdbefore 1:60.6.1-1~deb9u11:60.6.1-1~deb9u1
openSUSE:Leap 15.0MozillaFirefoxbefore 60.6.1-lp150.3.45.160.6.1-lp150.3.45.1
openSUSE:Leap 15.0MozillaThunderbirdbefore 60.6.1-lp150.3.37.160.6.1-lp150.3.37.1
Red Hat:enterprise_linux:6::clientfirefoxbefore 0:60.6.0-3.el6_100:60.6.0-3.el6_10
Red Hat:enterprise_linux:6::clientfirefox-debuginfobefore 0:60.6.0-3.el6_100:60.6.0-3.el6_10
Red Hat:enterprise_linux:6::clientthunderbirdbefore 0:60.6.1-1.el6_100:60.6.1-1.el6_10
Red Hat:enterprise_linux:6::clientthunderbird-debuginfobefore 0:60.6.1-1.el6_100:60.6.1-1.el6_10
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:60.6.0-3.el7_60:60.6.0-3.el7_6
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:60.6.0-3.el7_60:60.6.0-3.el7_6
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:60.6.1-1.el7_60:60.6.1-1.el7_6
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:60.6.1-1.el7_60:60.6.1-1.el7_6
Red Hat:enterprise_linux:8::appstreamfirefoxbefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamfirefox-debuginfobefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamfirefox-debugsourcebefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbirdbefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbird-debuginfobefore 0:60.6.1-1.el80:60.6.1-1.el8
Red Hat:enterprise_linux:8::appstreamthunderbird-debugsourcebefore 0:60.6.1-1.el80:60.6.1-1.el8
SUSE:Linux Enterprise Module for Desktop Applications 15MozillaFirefoxbefore 60.6.1-3.29.360.6.1-3.29.3
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 60.6.1-3.28.160.6.1-3.28.1

+2

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now
  • CVE-2013-1690Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properKEV
    86Now
  • CVE-2019-17026Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion.KEV
    79This week
  • CVE-2024-9680An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines.KEV
    76This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:firefox-esr60.6.0esr-1 · Debian:12Package registry (OSV)
debian:thunderbird1:60.6.1-1 · Debian:12Package registry (OSV)
opensuse:MozillaFirefox60.6.1-lp150.3.45.1 · openSUSE:Leap 15.0Package registry (OSV)
opensuse:MozillaThunderbird60.6.1-lp150.3.37.1 · openSUSE:Leap 15.0Package registry (OSV)
red hat:firefox0:60.6.0-3.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debuginfo0:60.6.0-3.el7_6 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:firefox-debugsource0:60.6.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:thunderbird0:60.6.1-1.el6_10 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird-debuginfo0:60.6.1-1.el6_10 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird-debugsource0:60.6.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:MozillaFirefox60.6.1esr-109.63.2 · SUSE:OpenStack Cloud 7Package registry (OSV)
suse:MozillaThunderbird60.6.1-3.28.1 · SUSE:Linux Enterprise Workstation Extension 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records