Tl-wr940n Firmware: Out-of-bounds Read
CVE-2023-36356 is a high-severity out-of-bounds read vulnerability in Tl-wr940n Firmware from TP-Link, with a CVSS 3.1 base score of 7.7 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. There is no confirmed exploitation so far. EPSS estimates a 0.71% chance of exploitation within 30 days, higher than 54% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Tl-wr940n Firmware you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| TP-Link | Tl-wr940n Firmware | Not specified in the record | Not stated |
| TP-Link | Tl-wr841n Firmware | Not specified in the record | Not stated |
| TP-Link | Tl-wr740n Firmware | Not specified in the record | Not stated |
| TP-Link | Tl-wr941nd Firmware | Not specified in the record | Not stated |
Version data comes from NVD's product matching. 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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H. Scored by NVD.
Official description
TP-Link TL-WR940N V2/V4/V6, TL-WR841N V8, TL-WR941ND V5, and TL-WR740N V1/V2 were discovered to contain a buffer read out-of-bounds via the component /userRpm/VirtualServerRpm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted GET request.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Technical write-ups (may include proof of concept)
- github.com/a101e-IoTvul/iotvul/blob/main/tp-link/4/TL-WR941ND_TL-WR940N_TL-WR740N_userRpm_VirtualServerRpm.mdExploit, Third Party Advisory
Other vulnerabilities in Tl-wr940n Firmware
- 7.2 High severity
- 7.2 High severity
- 8.2 High severity
- 8.0 High severity
- 6.5 Medium severity
- 7.5 High severity
Recent Out-of-bounds Read vulnerabilities
- 9.1 Critical severity
- 7.5 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.1 High severity
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