Is CVE-2021-31439 in the CISA KEV catalog?

No. CVE-2021-31439 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31439?

CVE-2021-31439 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-31439?

CVE-2021-31439 has an EPSS score of 2.33% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31439?

Upgrade netatalk on debian 11 to 3.1.12~ds-8+deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-31439

HIGHEPSS 81th pctl

8.8

CVSS v3

NVD

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager. Authentication is not required to exploit this vulnerablity. The specific flaw exists within the processing of DSI structures in Netatalk. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-12326.

CWE-122Heap-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

netatalkDebian

Fixed in:3.1.12~ds-8+deb11u1CVE-2021-31439

Fixed in:3.1.13~ds-1CVE-2021-31439

netatalkUbuntu

Fixed in:2.2.2-1ubuntu2.2+esm1USN-6146-1

Fixed in:2.2.5-1ubuntu0.2+esm1USN-6146-1

Fixed in:2.2.6-1ubuntu0.18.04.2+esm1USN-6146-1

Fixed in:3.1.12~ds-4ubuntu0.20.04.1USN-6146-1

Fixed in:3.1.12~ds-9ubuntu0.22.04.1USN-6146-1

Fixed in:3.1.13~ds-2ubuntu0.22.10.1USN-6146-1

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.33%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Vendor Advisory1

synology.com

Third-Party Advisory4

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	86%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	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 2025-01-14.