Mozilla Firefox/Thunderbird 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 marked as critical has been reported in Mozilla Firefox and Thunderbird. This affects an unknown part. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2018-5187. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox and Thunderbird (Web Browser) (the affected version is unknown). This affects an unknown code. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Memory safety bugs present in Firefox 60 and Firefox ESR 60. 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 Thunderbird < 60, Firefox ESR < 60.1, and Firefox < 61.

The bug was discovered 06/26/2018. The weakness was disclosed 10/18/2018 by Christian Holler (Basti) with Dell as Bug 1461324 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2018-5187 since 01/02/2018. It is possible to initiate the attack remotely. No form of authentication is needed for 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 was handled as a non-public zero-day exploit for at least 41 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 111980 (Mozilla Thunderbird < 60.0 Multiple 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 171560 (OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2018:2658-1)).

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 (111980) and SecurityFocus (BID 104556†). The entries VDB-120044, VDB-120045, VDB-120046 and VDB-120047 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality 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: 111980
Nessus Name: Mozilla Thunderbird < 60.0 Multiple 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: 🔍

Timelineinfo

01/02/2018 🔍
06/26/2018 +174 days 🔍
06/26/2018 +0 days 🔍
08/06/2018 +40 days 🔍
08/20/2018 +14 days 🔍
10/18/2018 +58 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 1461324
Researcher: Christian Holler (Basti)
Organization: Dell
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-5187 (🔍)
GCVE (CVE): GCVE-0-2018-5187
GCVE (VulDB): GCVE-100-125787

OVAL: 🔍

SecurityFocus: 104556 - Mozilla Firefox and Firefox ESR Multiple Unspecified Memory Corruption Vulnerabilities

See also: 🔍

Entryinfo

Created: 10/19/2018 06:57
Updated: 11/26/2025 08:54
Changes: 10/19/2018 06:57 (75), 04/05/2020 16:23 (7), 11/26/2025 08:54 (17)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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