CVE-2021-36064

Arbitrary code execution via ParseFullNS buffer underflow

Published Sep 1, 2021 · Updated Nov 3, 2025

Buffer underflow in Adobe XMP Toolkit SDK 2020.1 and earlier allows attackers to execute arbitrary code when a victim opens a malicious file. The SVG_Adapter ParseFullNS routine mishandles namespace data and underflows a buffer while parsing crafted input. Exploitation requires user interaction, and resulting code executes with the current user's privileges.

CVSS severity8.4
High
EPSS probability2.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer underflow in Adobe XMP Toolkit SDK 2020.1 and earlier allows attackers to execute arbitrary code when a victim opens a malicious file. The SVG_Adapter ParseFullNS routine mishandles namespace data and underflows a buffer while parsing crafted input. Exploitation requires user interaction, and resulting code executes with the current user's privileges.

The record

CVE
CVE-2021-36064
Published
Sep 1, 2021
Updated
Nov 3, 2025
Vendor
Adobe
Product
XMP Toolkit SDK
Classifications
CWE-124, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2020.1
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · XMP Toolkit SDKversion=unspecified <=2020.1; version=unspecified <=None

Published CVSS scores

9.3National Vulnerability DatabaseAV:N/AC:M/Au:N/C:C/I:C/A:C
7.8Adobe Systems Incorporated (CNA) via NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.4Adobe Systems IncorporatedCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-124Buffer Underwrite ('Buffer Underflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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