Mozilla Thunderbird up to 102.9 OCSP Revocation Status certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Mozilla Thunderbird up to 102.9. Impacted is an unknown function of the component OCSP Revocation Status Handler. Performing a manipulation results in certificate validation. This vulnerability is identified as CVE-2023-0547. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Mozilla Thunderbird up to 102.9 (Mail Client Software). This affects some unknown functionality of the component OCSP Revocation Status Handler. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity, and availability. The summary by CVE is:

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted. Thunderbird versions from 68 to 102.9.1 were affected by this bug. This vulnerability affects Thunderbird < 102.10.

The weakness was released 04/11/2023 by Paul Menzel as Bug 1811298 as confirmed advisory (Website). It is possible to read the advisory at bugzilla.mozilla.org. The advisory contains:

OCSP revocation status of recipient certificates was not checked when sending S/Mime encrypted email, and revoked certificates would be accepted. Thunderbird versions from 68 to 102.9.1 were affected by this bug.
This vulnerability is uniquely identified as CVE-2023-0547. 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 07/09/2025). The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 239763 (TencentOS Server 4: thunderbird (TSSA-2024:0450)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 102.10 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (239763) and EUVD (EUVD-2023-12592). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.1
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
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: 239763
Nessus Name: TencentOS Server 4: thunderbird (TSSA-2024:0450)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Thunderbird 102.10

Timelineinfo

01/27/2023 🔍
04/11/2023 +73 days 🔍
04/11/2023 +0 days 🔍
04/14/2023 +3 days 🔍
07/09/2025 +817 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: Bug 1811298
Researcher: Paul Menzel
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2023-0547 (🔍)
GCVE (CVE): GCVE-0-2023-0547
GCVE (VulDB): GCVE-100-226011
EUVD: 🔍

Entryinfo

Created: 04/14/2023 16:44
Updated: 07/09/2025 20:30
Changes: 04/14/2023 16:44 (18), 04/14/2023 16:47 (11), 04/14/2023 16:48 (17), 05/03/2023 13:54 (1), 01/10/2025 21:38 (36), 04/27/2025 09:22 (3), 06/20/2025 15:07 (2), 07/09/2025 20:30 (1)
Complete: 🔍
Cache ID: 216::103

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

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