Vigor2960: Improper Neutralization of Special Elements in Output Used by a Downstream Component
CVE-2026-113389 is a critical-severity improper neutralization of special elements in output used by a downstream component vulnerability in Vigor2960 from DrayTek, with a CVSS 3.1 base score of 9.9 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 Vigor2960 versions: 1.5.1.6 Revision 8218. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.88% chance of exploitation within 30 days, higher than 80% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of Vigor2960 you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
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
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- 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:C/C:H/I:H/A:H. Scored by CNA (vuldb.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.6 | High | CNA (vuldb.com) |
| CVSS 3.1 | 9.9 | Critical | CNA (vuldb.com) |
| CVSS 2.0 | 9.0 | High | CNA (vuldb.com) |
Official description
A vulnerability was detected in DrayTek Vigor2960 1.5.1.6 Revision 8218. Affected by this vulnerability is the function set_table of the file /cgi-bin/mainfunction.cgi of the component CGI Process. The manipulation of the argument sectiontype results in command injection. The attack may be launched remotely. The exploit is now public and may be used. The vendor explains: "2960 1.5.1.7 has corrected many security issues. And 2960 is EoS with limited support, only major issues would be reviewed(e.g. unauthenticated vuln.)". This vulnerability only affects products that are no longer supported by the maintainer.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements in Output Used by a Downstream Component
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
How developers prevent this class of flaw
- Programming languages and supporting technologies might be chosen which are not subject to these issues.
- Utilize an appropriate mix of allowlist and denylist parsing to filter control-plane syntax from all input.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
References
Other references
Other vulnerabilities in Vigor2960
- 7.4 High severity
- 7.4 High severity
- 7.4 High severity
- 7.4 High severity
- 7.4 High severity
- 9.9 Critical severity
Recent Improper Neutralization of Special Elements in Output Used by a Downstream Component vulnerabilities
- 8.8 High severity
- 7.3 High severity
- 9.9 Critical severity
- 7.3 High severity
- 7.3 High severity
- 7.3 High severity
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