Apple watchOS up to 5.3.6/6.2.4 Mail memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Apple watchOS up to 5.3.6/6.2.4. This impacts an unknown function of the component Mail. Executing a manipulation can lead to memory corruption. This vulnerability is tracked as CVE-2020-9819. The attack can be launched remotely. Moreover, an exploit is present. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Apple watchOS up to 5.3.6/6.2.4 (Smartwatch Operating System). This vulnerability affects an unknown code block of the component Mail. 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:

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5, watchOS 5.3.7. Processing a maliciously crafted mail message may lead to heap corruption.

The weakness was disclosed 05/18/2020 with ZecOps.com as HT211175 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability was named CVE-2020-9819. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are unknown but an exploit is available. The advisory points out:

A memory consumption issue was addressed with improved memory handling.

It is declared as attacked. This issue was added on 11/03/2021 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 05/03/2022:

Apply updates per vendor instructions.

Upgrading to version 5.3.7 or 6.2.5 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2020-30598). The entries VDB-155673, VDB-155674, VDB-155675 and VDB-155676 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: 5.0
VulDB Meta Temp Score: 4.9

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

NVD Base Score: 4.3
NVD Vector: 🔍

CNA Base Score: 4.3
CNA 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: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: watchOS 5.3.7/6.2.5

Timelineinfo

03/02/2020 🔍
05/18/2020 +77 days 🔍
05/18/2020 +0 days 🔍
05/29/2020 +11 days 🔍
07/29/2025 +1887 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT211175
Organization: ZecOps.com
Status: Confirmed

CVE: CVE-2020-9819 (🔍)
GCVE (CVE): GCVE-0-2020-9819
GCVE (VulDB): GCVE-100-155692
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/30/2020 00:20
Updated: 07/29/2025 06:44
Changes: 05/30/2020 00:20 (46), 05/30/2020 00:25 (17), 10/19/2020 17:07 (1), 04/20/2024 10:40 (28), 09/10/2024 22:45 (1), 01/29/2025 20:46 (12), 05/05/2025 17:58 (3), 07/29/2025 06:44 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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