Adobe Acrobat Reader PDF File stack-based overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$5k-$25k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Adobe Acrobat Reader up to 2017.011.30199/2020.004.30006/2021.005.20060. This affects an unknown part of the component PDF File Handler. The manipulation leads to stack-based overflow. This vulnerability is documented as CVE-2021-39846. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Adobe Acrobat Reader up to 2017.011.30199/2020.004.30006/2021.005.20060 (Document Reader Software). It has been rated as critical. This issue affects some unknown processing of the component PDF File Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability.

The weakness was released 09/30/2021 as apsb21-55. The advisory is shared at helpx.adobe.com. The identification of this vulnerability is CVE-2021-39846 since 08/23/2021. 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 $5k-$25k at the moment (estimation calculated on 09/30/2021).

Upgrading eliminates this vulnerability.

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Productinfo

Type

Document Reader Software

Vendor

Adobe

Name

Acrobat Reader

Version

License

free

Website

Vendor: https://www.adobe.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

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

CNA Base Score: 6.3
CNA Vector (Adobe Systems Incorporated): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/23/2021 🔍
09/30/2021 +38 days 🔍
09/30/2021 +0 days 🔍
10/04/2021 +4 days 🔍

Sourcesinfo

Vendor: adobe.com

Advisory: apsb21-55
Status: Confirmed

CVE: CVE-2021-39846 (🔍)
GCVE (CVE): GCVE-0-2021-39846
GCVE (VulDB): GCVE-100-183581

Entryinfo

Created: 09/30/2021 08:21
Updated: 10/04/2021 08:55
Changes: 09/30/2021 08:21 (51), 10/04/2021 08:55 (1)
Complete: 🔍
Cache ID: 216::103