CVE-2020-9592Public exploit

Signed PDF content spoofing via trusted incremental updates

Published Jun 25, 2020 · Updated Aug 4, 2024

Security-feature bypass in Adobe Acrobat and Reader 2020.006.20042 and earlier allows attackers to spoof signed PDFs via crafted files. Signature validation treats incremental updates to hidden PDF objects, overlays, fonts, or cross-reference tables as harmless, so altered content retains a valid signature indicator. Attackers must control the PDF before signing, modify it afterward, and induce a recipient to open it; the 2017.011.30166 and earlier and 2015.006.30518 and earlier tracks are also affected.

CVSS severity7.8
High
EPSS probability2.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security-feature bypass in Adobe Acrobat and Reader 2020.006.20042 and earlier allows attackers to spoof signed PDFs via crafted files. Signature validation treats incremental updates to hidden PDF objects, overlays, fonts, or cross-reference tables as harmless, so altered content retains a valid signature indicator. Attackers must control the PDF before signing, modify it afterward, and induce a recipient to open it; the 2017.011.30166 and earlier and 2015.006.30518 and earlier tracks are also affected.

The record

CVE
CVE-2020-9592
Published
Jun 25, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1036, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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.

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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 exploitPublished

Weakness, pattern, technique

T1036Masquerading
T1204.002Malicious File

Public exploit references

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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