CVE-2021-28550 (GCVE-0-2021-28550)
Vulnerability from cvelistv5 – Published: 2021-09-02 16:07 – Updated: 2025-10-21 23:25Title
Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution
Summary
Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
9.6 (Critical)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 18:17 UTC
CWE
- CWE-416 - Use After Free (CWE-416)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/acrobat… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Acrobat Reader |
Affected:
unspecified , ≤ 2020.001.30020
(custom)
Affected: unspecified , ≤ 2021.001.20150 (custom) Affected: unspecified , ≤ 2017.011.30194 (custom) Affected: unspecified , ≤ None (custom) |
Date Public
2021-05-11 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7e670269-e61c-4754-90ba-626764f3f4b1
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Adobe Acrobat and Reader Use-After-Free Vulnerability | Affected: Adobe / Acrobat and Reader | Description: Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-28550
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-416 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Acrobat and Reader |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Adobe |
| Vulnerabilityname | Adobe Acrobat and Reader Use-After-Free Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 74581d85-f25a-4eaf-82f2-3a5968ad11b2
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution | Affected: Adobe / Acrobat Reader | CVSS: 9.6 (CRITICAL) | EPSS: 0.52005 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution |
| Cve Id | CVE-2021-28550 |
| Vendor | Adobe |
| Ghsa Id | None |
| Product | Acrobat Reader |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 9.6 |
| Epss Score | 0.52005 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.98922 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2021-28550 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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"cveId": "CVE-2021-28550",
"datePublished": "2021-09-02T16:07:20.687Z",
"dateReserved": "2021-03-16T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:25:35.586Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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