Security readout for executives and security teams
Plain-English summary
A malicious document can exploit Adobe Acrobat Reader to run code as the person who opens it. The attacker does not need a login, but the victim must open the malicious file. Business impact is workstation compromise, data theft, or malware execution under the user’s permissions.
Executive priority
Treat this as a high-priority endpoint patching issue. It requires user interaction, but document-based attacks are common business exposure, and successful exploitation can execute attacker code as the user.
Technical view
CVE-2021-35980 is a CWE-22 path traversal issue in Adobe Acrobat Reader SpellDictionaryExport. Affected Acrobat Reader DC 2021.005.20054 and earlier, 2020.004.30005 and earlier, and 2017.011.30197 and earlier can allow arbitrary code execution in the current user context after user interaction.
Likely exposure
Exposure is concentrated on endpoints running affected Adobe Acrobat Reader versions, especially where users receive and open external documents. Server-side exposure is not indicated by the provided sources.
Exploitation context
The provided sources describe unauthenticated code execution requiring a victim to open a malicious file. The bundle does not show CISA KEV listing or cited evidence of active exploitation.
Researcher notes
The record identifies path traversal in SpellDictionaryExport with CVSS 3.1 score 7.8. Evidence is limited to the CVE data and Adobe advisory reference; no exploit-in-the-wild claim is supported here.
Mitigation direction
- Apply Adobe Acrobat Reader security updates referenced in APSB21-51.
- Prioritize Reader DC, 2020, and 2017 installs at or below listed affected versions.
- Limit user exposure to unsolicited documents from email, web downloads, and shared drives.
- Use least-privilege desktop accounts to reduce post-exploitation impact.
- Check Adobe guidance for any environment-specific mitigations or compensating controls.
Validation and detection
- Inventory Adobe Acrobat Reader versions across managed endpoints.
- Flag Reader DC versions 2021.005.20054 and earlier.
- Flag Reader 2020 versions 2020.004.30005 and earlier.
- Flag Reader 2017 versions 2017.011.30197 and earlier.
- Confirm patched endpoints no longer report affected versions.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-35980 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/acrobat/apsb21-51.htmlCVE reference · vendor-advisory
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.