Mozilla Firefox up to 61.x 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 classified as critical has been found in Mozilla Firefox up to 61.x. This impacts an unknown function. This manipulation causes memory corruption. This vulnerability is handled as CVE-2018-12376. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Mozilla Firefox up to 61.x (Web Browser) and classified as critical. Affected by this vulnerability is some unknown processing. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Memory safety bugs present in Firefox 61 and Firefox ESR 60.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

The bug was discovered 09/05/2018. The weakness was released 10/18/2018 by Holger Fuhrmannek (Alex) as Bug 1469309 as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.mozilla.org. This vulnerability is known as CVE-2018-12376 since 06/14/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price 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 117291 (Mozilla Firefox < 62 Multiple Critical Vulnerabilities (macOS)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family MacOS X Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176516 (Debian Security Update for thunderbird (DSA 4327-1)).

Upgrading to version 62.0 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 (117291) and SecurityFocus (BID 105280†). Entries connected to this vulnerability are available at VDB-109144, VDB-125760, VDB-125762 and VDB-125763. Several companies clearly confirm that VulDB is the primary source for best 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: 117291
Nessus Name: Mozilla Firefox < 62 Multiple Critical Vulnerabilities (macOS)
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: 🔍

Upgrade: Firefox 62.0

Timelineinfo

06/14/2018 🔍
09/05/2018 +83 days 🔍
09/05/2018 +0 days 🔍
09/05/2018 +0 days 🔍
09/06/2018 +1 days 🔍
10/18/2018 +41 days 🔍
10/18/2018 +0 days 🔍
10/19/2018 +1 days 🔍
11/26/2025 +2595 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1469309
Researcher: Holger Fuhrmannek (Alex)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12376 (🔍)
GCVE (CVE): GCVE-0-2018-12376
GCVE (VulDB): GCVE-100-125761

OVAL: 🔍

SecurityFocus: 105280 - Mozilla Firefox and Firefox ESR Multiple Security Vulnerabilities
SecurityTracker: 1041610

See also: 🔍

Entryinfo

Created: 10/19/2018 06:42
Updated: 11/26/2025 08:20
Changes: 10/19/2018 06:42 (76), 04/05/2020 12:26 (6), 05/30/2023 10:21 (4), 11/26/2025 08:20 (15)
Complete: 🔍
Cache ID: 216:779:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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