SD-330AC: Stack-based Buffer Overflow
CVE-2026-32955 is a high-severity stack-based buffer overflow vulnerability in SD-330AC from Silex Technology, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected SD-330AC versions: Ver.1.42 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.62% chance of exploitation within 30 days, higher than 51% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Sd-330ac Firmware to 1.50 or a later version.
- Read the advisory on silex.jp for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Silex Technology | SD-330AC | Ver.1.42 and earlier | Not stated |
| Silex Technology | AMC Manager | Ver.5.0.2 and earlier | Not stated |
| Silextechnology | Sd-330ac Firmware | before 1.50 | 1.50 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (jpcert.or.jp).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.7 | High | CNA (jpcert.or.jp) |
| CVSS 3.1 | 8.8 | High | CNA (jpcert.or.jp) |
Official description
SD-330AC and AMC Manager provided by silex technology, Inc. contain a stack-based buffer overflow vulnerability in processing the redirect URLs. Arbitrary code may be executed on the device.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Stack-based Buffer Overflow
The product writes past the end of a buffer that was allocated on the stack.
How developers prevent this class of flaw
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
- Implement and perform bounds checking on input.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- jvn.jp/en/vu/JVNVU94271449/Third Party Advisory
Other vulnerabilities in SD-330AC
- 7.5 High severity
- 9.8 Critical severity
Recent Stack-based Buffer Overflow vulnerabilities
- 9.9 Critical severity
- 8.6 High severity
- 7.5 High severity
- 9.8 Critical severity
- 8.7 High severity
- 7.5 High severity
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