Security readout for executives and security teams
Plain-English summary
CVE-2021-28580 affects Medium by Adobe 2.4.5.331 and earlier. A malicious file can trigger a buffer overflow when opened, potentially letting an attacker run code as the current user. The main business risk is compromise of workstations where users handle untrusted files.
Executive priority
Treat this as a high-priority endpoint remediation item where Adobe Medium is present. It is not described as actively exploited, but successful exploitation could give an attacker control in the user context.
Technical view
The issue is a CWE-120 buffer overflow in Medium by Adobe file parsing. It is remotely reachable through a crafted file, requires no authentication, but requires user interaction. CVSS 3.1 is 8.8 with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to systems with Medium by Adobe 2.4.5.331 or earlier installed, especially endpoints where users may open files from external or untrusted sources.
Exploitation context
The source bundle does not show CISA KEV listing or evidence of active exploitation. Exploitation requires convincing a user to open a malicious file, so phishing and file-sharing workflows are the most relevant risk paths.
Researcher notes
The available evidence identifies the vulnerable product, version boundary, weakness class, impact, and user-interaction requirement. The bundle does not provide exploit-in-the-wild evidence, detailed root cause, or a named fixed version.
Mitigation direction
- Inventory endpoints for Medium by Adobe installations and versions.
- Prioritize remediation for version 2.4.5.331 and earlier.
- Review Adobe APSB21-34 and apply vendor guidance.
- Limit opening untrusted Medium files until remediation is confirmed.
- Use endpoint controls to reduce impact from suspicious file execution.
Validation and detection
- Confirm whether Medium by Adobe is installed on managed endpoints.
- Verify installed versions are not 2.4.5.331 or earlier.
- Check Adobe APSB21-34 for the vendor-supported remediation path.
- Review security telemetry for suspicious file-open events involving Medium.
- Document exceptions where affected versions cannot be remediated immediately.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
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-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2021-28580 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/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/medium/apsb21-34.htmlCVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.