Mozilla Firefox/Firefox ESR/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 labeled as critical has been found in Mozilla Firefox, Firefox ESR and Thunderbird. This issue affects some unknown processing in the library /usr/lib/browser-plugins/. Executing a manipulation can lead to memory corruption. This vulnerability is tracked as CVE-2017-7826. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (the affected version unknown). This vulnerability affects an unknown part in the library /usr/lib/browser-plugins/. 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. CVE summarizes:

Memory safety bugs were reported in Firefox 56 and Firefox ESR 52.4. 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 < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.

The bug was discovered 11/14/2017. The weakness was disclosed 06/11/2018 with Mozilla as Bug 1394530 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.mozilla.org. This vulnerability was named CVE-2017-7826 since 04/12/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/26/2025).

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 104648 (openSUSE Security Update : MozillaFirefox (openSUSE-2017-1279)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370658 (Mozilla Firefox Multiple Vulnerabilities. (mfsa2017-24,mfsa2017-25)).

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

The vulnerability is also documented in the databases at Tenable (104648) and SecurityFocus (BID 101832†). The entries VDB-119333, VDB-119334, VDB-119336 and VDB-119337 are pretty similar. Once again VulDB remains the best 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

AVACAuCIA
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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: 104648
Nessus Name: openSUSE Security Update : MozillaFirefox (openSUSE-2017-1279)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 100689
OpenVAS Name: CentOS Update for firefox CESA-2017:3247 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/12/2017 🔍
11/14/2017 +216 days 🔍
11/14/2017 +0 days 🔍
11/16/2017 +2 days 🔍
11/17/2017 +1 days 🔍
06/11/2018 +205 days 🔍
06/11/2018 +0 days 🔍
06/12/2018 +1 days 🔍
11/26/2025 +2724 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1394530
Organization: Mozilla
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7826 (🔍)
GCVE (CVE): GCVE-0-2017-7826
GCVE (VulDB): GCVE-100-119332

OVAL: 🔍

SecurityFocus: 101832 - Mozilla Firefox Prior to 57 Multiple Security Vulnerabilities
SecurityTracker: 1039803

See also: 🔍

Entryinfo

Created: 06/12/2018 08:49
Updated: 11/26/2025 06:09
Changes: 06/12/2018 08:49 (77), 02/17/2020 19:25 (5), 03/22/2023 12:09 (4), 11/26/2025 06:09 (17)
Complete: 🔍
Cache ID: 216:337:103

Once again VulDB remains the best source for vulnerability data.

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