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CVE-2018-18493· NVD / CVE Program· CNA mozilla

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use

Noroxi assessment

Priority: Plan (action score 40/100)

  • 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: 4.9% (FIRST EPSS); higher than 92% 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. No special conditions are required; it is repeatable.
  • Fixed version: firefox-esr (Debian:12) 60.4.0esr-1; thunderbird (Debian:12) 1:60.4.0-1; firefox-esr (Debian:8) 60.4.0esr-1~deb8u1.

Add it to your regular patch cycle. Upgrade to firefox-esr (Debian:12) 60.4.0esr-1; thunderbird (Debian:12) 1:60.4.0-1; firefox-esr (Debian:8) 60.4.0esr-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

Primary sources: NVD · CVE.org · FIRST EPSS

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of 64-bit. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

CriticalCVSS 9.8 · v3.0—No exploit Fix available
Published
Feb 28, 2019
Updated
Jun 16, 2026
EPSS
4.9% · 92th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 4.9%

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.

Follow CVE-2018-18493

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
mozillathunderbird
debiandebian linux
canonicalubuntu linux
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux server tus
redhatenterprise linux workstation

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 60.4.0
  • mozilla firefoxbefore 64.0
  • mozilla thunderbirdbefore 60.4.0
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.6
  • redhat enterprise linux server eus7.6
  • redhat enterprise linux server tus7.6
  • redhat enterprise linux workstation6.0
  • redhat enterprise linux workstation7.0

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 64affected

  • Mozilla Firefox ESR

    • unspecified and later · before 60.4affected

  • Mozilla Thunderbird

    • unspecified and later · before 60.4affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12firefox-esrbefore 60.4.0esr-160.4.0esr-1
Debian:12thunderbirdbefore 1:60.4.0-11:60.4.0-1
Debian:8firefox-esrbefore 60.4.0esr-1~deb8u160.4.0esr-1~deb8u1
Debian:8thunderbirdbefore 1:60.4.0-1~deb8u11:60.4.0-1~deb8u1
Debian:9firefox-esrbefore 60.4.0esr-1~deb9u160.4.0esr-1~deb9u1
Debian:9thunderbirdbefore 1:60.4.0-1~deb9u11:60.4.0-1~deb9u1
Red Hat:enterprise_linux:6::clientfirefoxbefore 0:60.4.0-1.el60:60.4.0-1.el6
Red Hat:enterprise_linux:6::clientfirefox-debuginfobefore 0:60.4.0-1.el60:60.4.0-1.el6
Red Hat:enterprise_linux:6::clientthunderbirdbefore 0:60.4.0-1.el60:60.4.0-1.el6
Red Hat:enterprise_linux:6::clientthunderbird-debuginfobefore 0:60.4.0-1.el60:60.4.0-1.el6
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:60.4.0-1.el70:60.4.0-1.el7
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:60.4.0-1.el70:60.4.0-1.el7
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:60.4.0-1.el7_60:60.4.0-1.el7_6
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:60.4.0-1.el7_60:60.4.0-1.el7_6
SUSE:Linux Enterprise Module for Basesystem 15mozilla-nsprbefore 4.20-3.3.24.20-3.3.2
SUSE:Linux Enterprise Module for Basesystem 15mozilla-nssbefore 3.40.1-3.7.23.40.1-3.7.2
SUSE:Linux Enterprise Module for Desktop Applications 15MozillaFirefoxbefore 60.4.0-3.21.160.4.0-3.21.1
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 60.5.0-3.20.260.5.0-3.20.2
SUSE:OpenStack Cloud 7mozilla-nsprbefore 4.20-19.6.14.20-19.6.1
SUSE:OpenStack Cloud 7mozilla-nssbefore 3.40.1-58.18.13.40.1-58.18.1
SUSE:OpenStack Cloud 7MozillaFirefoxbefore 60.4.0esr-109.55.160.4.0esr-109.55.1
SUSE:Package Hub 12MozillaThunderbirdbefore 60.5.1-79.160.5.1-79.1

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

Published before and after this one in the same product

  • ← EarlierCVE-2018-12407Feb 28, 2019 · A buffer overflow occurs when drawing and validating elements with the ANGLE graphics library, used for WebGL content, when working with the
    40Plan
  • ← EarlierCVE-2018-18492Feb 28, 2019 · A use-after-free vulnerability can occur after deleting a selection element due to a weak reference to the select element in the options col
    42Plan
  • Later →CVE-2018-18494Feb 28, 2019 · A same-origin policy violation allowing the theft of cross-origin URL entries when using the Javascript location property to cause a redirec
    26Monitor

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-esr60.4.0esr-1 · Debian:12Package registry (OSV)
debian:thunderbird1:60.4.0-1 · Debian:12Package registry (OSV)
red hat:firefox0:60.4.0-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:firefox-debuginfo0:60.4.0-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird0:60.4.0-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:thunderbird-debuginfo0:60.4.0-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
suse:mozilla-nspr4.20-3.3.2 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)
suse:mozilla-nss3.40.1-3.7.2 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)
suse:MozillaFirefox60.4.0-3.21.1 · SUSE:Linux Enterprise Module for Desktop Applications 15Package registry (OSV)
suse:MozillaThunderbird60.5.0-3.20.2 · 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.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (14 more)

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

All records