Is CVE-2021-0561 in the CISA KEV catalog?

No. CVE-2021-0561 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-0561?

CVE-2021-0561 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-0561?

CVE-2021-0561 has an EPSS score of 0.46% (37th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-0561?

Upgrade flac on debian 11 to 1.3.3-2+deb11u1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-0561

MEDIUM

5.5

CVSS v3

NVD

Description

In append_to_verify_fifo_interleaved_ of stream_encoder.c, there is a possible out of bounds write due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-11Android ID: A-174302683

CWE-787Out-of-bounds Write

How to fix

Remediation Available

flacDebian

Fixed in:1.3.3-2+deb11u1CVE-2021-0561

Fixed in:1.3.4-1CVE-2021-0561

flacUbuntu

Fixed in:1.3.0-2ubuntu0.14.04.1+esm1USN-5733-1

Fixed in:1.3.1-4ubuntu0.1~esm1USN-5733-1

Fixed in:1.3.2-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-2ubuntu0.1USN-5733-1

libflac++6Ubuntu

Fixed in:1.3.0-2ubuntu0.14.04.1+esm1USN-5733-1

libflac++6v5Ubuntu

Fixed in:1.3.1-4ubuntu0.1~esm1USN-5733-1

Fixed in:1.3.2-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-2ubuntu0.1USN-5733-1

libflac8Ubuntu

Fixed in:1.3.0-2ubuntu0.14.04.1+esm1USN-5733-1

Fixed in:1.3.1-4ubuntu0.1~esm1USN-5733-1

Fixed in:1.3.2-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-1ubuntu0.1USN-5733-1

Fixed in:1.3.3-2ubuntu0.1USN-5733-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.46%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

Patch1

source.android.com

Third-Party Advisory2

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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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.