Snapdragon: Buffer Over-read
CVE-2026-21381 is a high-severity buffer over-read vulnerability in Snapdragon from Qualcomm, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Snapdragon versions: AR8035; Cologne; FastConnect 6200, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.15% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Snapdragon you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on docs.qualcomm.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Qualcomm | Snapdragon | AR8035; Cologne; FastConnect 6200; FastConnect 6700; FastConnect 6900; FastConnect 7800; FWA Gen 3 Ultra Platform; G2 Gen 1; and 32 more ranges | Not stated |
| Qualcomm | Ar8035 Firmware | Not specified in the record | Not stated |
| Qualcomm | Cologne Firmware | Not specified in the record | Not stated |
| Qualcomm | Fastconnect 6200 Firmware | Not specified in the record | Not stated |
| Qualcomm | Fastconnect 6700 Firmware | Not specified in the record | Not stated |
| Qualcomm | Fastconnect 6900 Firmware | Not specified in the record | Not stated |
| Qualcomm | Fastconnect 7800 Firmware | Not specified in the record | Not stated |
| Qualcomm | Fwa Gen 3 Ultra Firmware | Not specified in the record | Not stated |
| Qualcomm | G2 Gen 1 Firmware | Not specified in the record | Not stated |
| Qualcomm | Milos Firmware | Not specified in the record | Not stated |
| Qualcomm | Netrani Firmware | Not specified in the record | Not stated |
| Qualcomm | Orne Firmware | Not specified in the record | Not stated |
| Qualcomm | Palawan25 Firmware | Not specified in the record | Not stated |
| Qualcomm | Pandeiro Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6391 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6698au Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6777aq Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6787aq Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca6797aq Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca8081 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qca8337 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qcc2073 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qcc2076 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qcc710 Firmware | Not specified in the record | Not stated |
| Qualcomm | Qcn6224 Firmware | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE; 35 further products are omitted here. 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
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- 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:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.6 | High | CNA (qualcomm.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
Transient DOS when receiving a service data frame with excessive length during device matching over a neighborhood awareness network protocol connection.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Buffer Over-read
The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.
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
Other vulnerabilities in Snapdragon
- 7.1 High severity
- 7.0 High severity
Recent Buffer Over-read vulnerabilities
- 8.2 High severity
- 8.2 High severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 9.1 Critical severity
Spotted an error? Tell us.