What is the CVSS score of CVE-2021-47775?

CVE-2021-47775 has a CVSS 3.1 base score of 8.4 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of DNS are affected by CVE-2021-47775?

CVE-2021-47775 presents notable security risk, a out-of-bounds write vulnerability rated CVSS 8.4.

Is there a public PoC exploit available for CVE-2021-47775?

Yes, a public proof-of-concept exploit is available for CVE-2021-47775. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47775?

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

DNS CVE-2021-47775

HIGH

Out-of-bounds Write (CWE-787)

2026-01-15 disclosure@vulncheck.com

Buffer Overflow DNS

8.4

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 16, 2026 - 15:55 vuln.today

Public exploit code

CVE Published

Jan 15, 2026 - 16:16 nvd

HIGH 8.4

DescriptionNVD

YouTube Video Grabber, now referred to as YouTube Downloader, 1.9.9.1 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting the Structured Exception Handler. Attackers can craft a malicious payload of 712 bytes with SEH manipulation to trigger a bind shell connection on a specified local port.

AnalysisAI

Technical ContextAI

Classified as CWE-787 (Out-of-bounds Write). YouTube Video Grabber, now referred to as YouTube Downloader, 1.9.9.1 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting the Structured Exception Handler. Attackers can craft a malicious payload of 712 bytes with SEH manipulation to trigger a bind shell connection on a specified local port.

Affected ProductsAI

YouTube Video Grabber, now referred to as YouTube Downloader, 1.9.9.1 contains a buffer overflow vulnerability that allows attackers to execute arbitr

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible.

CVE-2021-47775 vulnerability details – vuln.today

Back

DNS CVE-2021-47775

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

Technical ContextAI

Affected ProductsAI

RemediationAI

Share

External POC / Exploit Code