Mozilla Firefox/Firefox ESR/Thunderbird Skia Library memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird. It has been classified as critical. This vulnerability affects unknown code of the component Skia Library. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2018-18493. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (unknown version). It has been rated as critical. This issue affects an unknown code block of the component Skia Library. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 12/11/2018. The weakness was published 02/28/2019 by Atte Kettunen (Nils) with Kryptos Logic as Bug 1504452 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.mozilla.org. The identification of this vulnerability is CVE-2018-18493 since 10/19/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/26/2025).

The vulnerability scanner Nessus provides a plugin with the ID 119606 (Mozilla Firefox ESR < 60.4 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197328 (Ubuntu Security Notification for Firefox Vulnerabilities (USN-3844-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119606) and SecurityFocus (BID 106168†). Similar entries are available at VDB-131251, VDB-131252, VDB-131253 and VDB-131254. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119606
Nessus Name: Mozilla Firefox ESR < 60.4 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/19/2018 🔍
12/11/2018 +53 days 🔍
12/11/2018 +0 days 🔍
12/11/2018 +0 days 🔍
12/12/2018 +1 days 🔍
02/28/2019 +78 days 🔍
03/01/2019 +1 days 🔍
11/26/2025 +2462 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1504452
Researcher: Atte Kettunen (Nils)
Organization: Kryptos Logic
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-18493 (🔍)
GCVE (CVE): GCVE-0-2018-18493
GCVE (VulDB): GCVE-100-131255

OVAL: 🔍

SecurityFocus: 106168 - Mozilla Firefox and Firefox ESR Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 03/01/2019 06:25
Updated: 11/26/2025 09:54
Changes: 03/01/2019 06:25 (75), 05/13/2020 10:13 (7), 11/26/2025 09:54 (17)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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