Out-of-bounds write in Brocade Fabric OS
Priority LOW 34CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
The command ipfilter in Brocade Fabric OS before Brocade Fabric OS v.9.0.1a, v8.2.3, and v8.2.0_CBN4, and v7.4.2h uses unsafe string function to process user input. Authenticated attackers can abuse this vulnerability to exploit stack-based buffer overflows, allowing execution of arbitrary code as the root user account.
Why it matters now
EPSS 0.00455 39th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Brocade Fabric OS | Brocade Fabric OS before Brocade Fabric OS v.9.0.1a, v8.2.3, and v8.2.0_CBN4, and v7.4.2h | — | No fix listed | CNA |
- Brocade Fabric OS Vendor— Affected Brocade Fabric OS before Brocade Fabric OS v.9.0.1a, v8.2.3, and v8.2.0_CBN4, and v7.4.2h Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:* | before 7.4.2h; 8.0.0 to before 8.2.0_cbn4; 8.2.1 to before 8.2.3; 9.0.0 to before 9.0.1a | Vulnerable | Broadcom |
- cpe:2.3:o:broadcom:fabric_operating_system:*:*:*:*:*:*:*:* Versions before 7.4.2h; 8.0.0 to before 8.2.0_cbn4; 8.2.1 to before 8.2.3; 9.0.0 to before 9.0.1a Vulnerable ·Broadcom
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27790
- 2026-10-03 Alias added: GHSA-qp38-g7j8-6pgx
References
More Broadcom Fabric Operating System vulnerabilities
- TI-2025-01721 Code injection exposure in Fabric OS 9.1.0 through 9.1.1d6 KEVCVSS 4.0HIGH 8.6
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
- TI-2022-10659 Information disclosure in https://github.com/curl/curl CVSS 3.1HIGH 7.5
- TI-2020-01888 Segmentation fault in SSL_check_chain CVSS 3.1HIGH 7.5
- TI-2022-06845 Improper authentication in https://github.com/curl/curl CVSS 3.1HIGH 8.1
- TI-2020-12413 scp in OpenSSH through 8.3p1 allows command injection in the scp.c toremote function, as… CVSS 3.1HIGH 7.8
Sources
- CVE-2021-27790 · CVE Program
- CVE-2021-27790 · NVD
- FIRST EPSS
- GHSA-qp38-g7j8-6pgx · GitHub Advisory Database · CC BY 4.0
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