Is CVE-2021-20747 in the CISA KEV catalog?

No. CVE-2021-20747 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20747?

CVE-2021-20747 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-20747?

CVE-2021-20747 has an EPSS score of 1.00% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20747?

Upgrade retty to 4.11.14 or later.

CVE & CISA-KEV Catalog

CVE-2021-20747

MEDIUM

4.3

CVSS v3

NVD

Description

Improper authorization in handler for custom URL scheme vulnerability in Retty App for Android versions prior to 4.8.13 and Retty App for iOS versions prior to 4.11.14 allows a remote attacker to lead a user to access an arbitrary website via the vulnerable App.

CWE-862Missing Authorization

How to fix

Remediation Available

rettyNVD

Affected:< 4.11.14Fixed in:4.11.14CVE-2021-20747derived from NVD

Affected:< 4.8.13Fixed in:4.8.13CVE-2021-20747derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.00%probability of exploitation in 30 days

59thpercentile

Moderate risk: more likely to be exploited than 59% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.