CVE-2021-39223 Security Vulnerability & Exploit Details

CVE-2021-39223
Vulnerability Scoring

4.8

/10

Medium Risk

The vulnerability CVE-2021-39223 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

Attack Complexity: High
Exploits require significant effort and special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: Required
User interaction is necessary for successful exploitation.

CVE-2021-39223 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:18 UTC
Originally published on: 🕙 25 Oct 2021, 22:15 UTC

Time between publication and last update: 1122 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

CVE-2021-39223 Vulnerability Summary

CVE-2021-39223: Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to versions 3.8.6 and 4.2.3 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the Richdocuments application is upgraded to 3.8.6 or 4.2.3. As a workaround, disable the Richdocuments application in the app settings.

Assessing the Risk of CVE-2021-39223

Access Complexity Graph

The exploitability of CVE-2021-39223 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-39223

This vulnerability, CVE-2021-39223, requires a high level of attack complexity and low privileges, making it difficult but not impossible to exploit. Organizations should ensure robust security configurations to mitigate risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-39223, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-39223, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2021-39223 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: None
CVE-2021-39223 poses no threat to data integrity.
Availability: None
CVE-2021-39223 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.118% (probability of exploit)

EPSS Percentile: 47.54% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 52.46% of others.

CVE-2021-39223 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

cpe:2.3:a:nextcloud:richdocuments:1.1.22:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.22:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.23:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.23:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.24:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.24:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.25:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.25:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.26:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.1.26:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.27:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.27:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.28:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.28:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.29:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.29:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.30:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.30:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.31:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.31:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.32:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.11.32:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:1.12.27:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.12.28:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:1.12.28:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:1.12.29:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:1.12.33:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:1.12.35:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:2.0.3:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:2.0.5:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:2.0.7:*:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:richdocuments:3.8.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.3:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.3:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.4:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.4:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.5:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:3.8.5:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.0:-:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.0:-:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.3:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.4:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.0.4:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.0:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:nextcloud:richdocuments:4.2.2:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-39223: Combat Critical CVE Threats

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CVE-2021-39223 Vulnerability Scoring