CVE-2021-1966· NVD / CVE Program· CNA qualcomm

Possible buffer overflow due to lack of length check of source and destination buffer before copying in Snapdragon Auto, Snapdragon Compute,

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
Someone with local access to the system can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Possible buffer overflow due to lack of length check of source and destination buffer before copying in Snapdragon Auto, Snapdragon Compute, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

MediumCVSS 6.7 · v3.1—No exploit No fix recorded

Memory safety

Published: Oct 20, 2021
Updated: Jun 16, 2026
EPSS: 0.1% · 4th percentile
CWE: CWE-120

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CNA vs NVD score

NVD: —
CNA · qualcomm: 6.7; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
qualcomm	aqt1000 firmware	cpe:2.3:o:qualcomm:aqt1000_firmware
qualcomm	aqt1000	cpe:2.3:h:qualcomm:aqt1000
qualcomm	ar8031 firmware	cpe:2.3:o:qualcomm:ar8031_firmware
qualcomm	ar8031	cpe:2.3:h:qualcomm:ar8031
qualcomm	ar8035 firmware	cpe:2.3:o:qualcomm:ar8035_firmware
qualcomm	ar8035	cpe:2.3:h:qualcomm:ar8035
qualcomm	csra6620 firmware	cpe:2.3:o:qualcomm:csra6620_firmware
qualcomm	csra6620	cpe:2.3:h:qualcomm:csra6620
qualcomm	csra6640 firmware	cpe:2.3:o:qualcomm:csra6640_firmware
qualcomm	csra6640	cpe:2.3:h:qualcomm:csra6640
qualcomm	fsm10055 firmware	cpe:2.3:o:qualcomm:fsm10055_firmware
qualcomm	fsm10055	cpe:2.3:h:qualcomm:fsm10055

and 118 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

qualcomm aqt1000 firmwareall versions
qualcomm ar8031 firmwareall versions
qualcomm ar8035 firmwareall versions
qualcomm csra6620 firmwareall versions
qualcomm csra6640 firmwareall versions
qualcomm fsm10055 firmwareall versions
qualcomm fsm10056 firmwareall versions
qualcomm qca6390 firmwareall versions
qualcomm qca6391 firmwareall versions
qualcomm qca6420 firmwareall versions
qualcomm qca6430 firmwareall versions
qualcomm qca6574 firmwareall versions
qualcomm qca6574a firmwareall versions
qualcomm qca6574au firmwareall versions
qualcomm qca6595 firmwareall versions
qualcomm qca6595au firmwareall versions
qualcomm qca6696 firmwareall versions
qualcomm qca8337 firmwareall versions
qualcomm qcm6125 firmwareall versions
qualcomm qcs405 firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (qualcomm). Independent of NVD's CPE analysis and usually ahead of it.

Qualcomm, Inc. Snapdragon Auto, Snapdragon Compute, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music
- AQT1000, AR8031, AR8035, CSRA6620, CSRA6640, FSM10055, FSM10056, QCA6390, QCA6391, QCA6420, QCA6430, QCA6574, QCA6574A, QCA6574AU, QCA6595, QCA6595AU, QCA6696, QCA8337, QCM6125, QCS405, QCS410, QCS610affected

Same product

qualcomm: all records

Other highest-scoring records for the same primary product.

CVE-2025-21479Incorrect Authorization in GraphicsKEV
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CVE-2025-21480Incorrect Authorization in Graphics WindowsKEV
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CVE-2021-1965Possible buffer overflow due to lack of parameter length check during MBSSID scan IE parse in Snapdragon Auto, Snapdragon Compute, Snapdrago
40Plan

Published before and after this one in the same product

← EarlierCVE-2021-1913Oct 20, 2021 · Possible integer overflow due to improper length check while updating grace period and count record in Snapdragon Auto, Snapdragon Compute,
33Monitor
← EarlierCVE-2021-1932Oct 20, 2021 · Improper access control in trusted application environment can cause unauthorized access to CDSP or ADSP VM memory with either privilege in
33Monitor
Later →CVE-2021-1968Oct 20, 2021 · Improper validation of kernel buffer address while copying information back to user buffer can lead to kernel memory information exposure to
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

www.qualcomm.com/company/product-security/bulletins/october-2021-bulletin

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records