Security readout for executives and security teams
Plain-English summary
This is a low-severity Adobe Acrobat Reader memory-disclosure issue. A victim must open a malicious file before an attacker can read limited sensitive memory. The main concern is not direct system compromise; it is that leaked memory could help defeat protections such as ASLR as part of a larger attack chain.
Executive priority
Treat this as routine patching unless Acrobat Reader is widely deployed on sensitive endpoints. It is unlikely to justify emergency response alone, but it should not linger because memory disclosure can support more serious exploit chains.
Technical view
CVE-2020-24426 is a CWE-125 out-of-bounds read in Acrobat Reader DC. Affected branches include 2020.012.20048 and earlier, 2020.001.30005 and earlier, and 2017.011.30175 and earlier. The CVSS 3.1 score is 3.3, with local attack vector, required user interaction, and low confidentiality impact.
Likely exposure
Exposure is mainly on endpoints that still run the listed Acrobat Reader DC versions and allow users to open untrusted PDF files. Systems without Adobe Reader, or already updated beyond the affected versions, are not indicated as exposed by the provided sources.
Exploitation context
The sources state exploitation requires user interaction: the victim must open a malicious file. The CVE is not listed in CISA KEV in the provided bundle, and no cited source here confirms active exploitation.
Researcher notes
The vulnerability is an out-of-bounds read with confidentiality-only impact. The useful security relevance is mitigation bypass support, especially ASLR, rather than direct code execution. The supplied evidence does not establish exploit availability, active exploitation, or additional affected Adobe products.
Mitigation direction
- Apply the Adobe security update referenced in APSB20-67.
- Remove or upgrade Acrobat Reader versions at or below the affected builds.
- Reduce user exposure to unsolicited or untrusted PDF attachments.
- Use attachment scanning and email filtering for malicious document delivery paths.
- Check Adobe guidance for unsupported or legacy Reader installations.
Validation and detection
- Inventory Acrobat Reader versions across endpoints.
- Confirm no installations remain at the affected version thresholds.
- Verify the Adobe APSB20-67 update is deployed where applicable.
- Review endpoint telemetry for suspicious document-opening events.
- Confirm users cannot routinely open high-risk attachments without scanning.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-125: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-24426 mapping review
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Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.3LowVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/acrobat/apsb20-67.htmlCVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-20-1354/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.