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CVE-2021-1983· NVD / CVE Program· CNA qualcomm

Possible buffer overflow due to improper handling of negative data length while processing write request in VR service in Snapdragon Auto, S

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. 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 improper handling of negative data length while processing write request in VR service in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Wearables

HighCVSS 7.8 · v3.1—No exploit No fix recorded
Published
Oct 20, 2021
Updated
Jun 16, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
7.8
CNA · qualcomm
8.4
0.6 point gap

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

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.

Follow CVE-2021-1983

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
qualcommapq8017 firmware
qualcommapq8017
qualcommapq8053 firmware
qualcommapq8053
qualcommapq8064au firmware
qualcommapq8064au
qualcommapq8096au firmware
qualcommapq8096au
qualcommaqt1000 firmware
qualcommaqt1000
qualcommmsm8917 firmware
qualcommmsm8917

and 178 more

Affected versions

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

  • qualcomm apq8017 firmwareall versions
  • qualcomm apq8053 firmwareall versions
  • qualcomm apq8064au firmwareall versions
  • qualcomm apq8096au firmwareall versions
  • qualcomm aqt1000 firmwareall versions
  • qualcomm msm8917 firmwareall versions
  • qualcomm msm8953 firmwareall versions
  • qualcomm msm8996au firmwareall versions
  • qualcomm qca6310 firmwareall versions
  • qualcomm qca6320 firmwareall versions
  • qualcomm qca6335 firmwareall versions
  • qualcomm qca6390 firmwareall versions
  • qualcomm qca6391 firmwareall versions
  • qualcomm qca6420 firmwareall versions
  • qualcomm qca6426 firmwareall versions
  • qualcomm qca6430 firmwareall versions
  • qualcomm qca6436 firmwareall versions
  • qualcomm qca6564a firmwareall versions
  • qualcomm qca6564au firmwareall versions
  • qualcomm qca6574a 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 Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Wearables

    • APQ8017, APQ8053, APQ8064AU, APQ8096AU, AQT1000, MSM8917, MSM8953, MSM8996AU, QCA6310, QCA6320, QCA6335, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564A, QCA6564AU, QCA6574A, QCA6574AU,affected

Same product

qualcomm: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-21483Improper Restriction of Operations within the Bounds of a Memory Buffer in Data Network Stack & Connectivity
    39Monitor
  • CVE-2022-25686Memory corruption in video module due to buffer overflow while processing WAV file in Snapdragon Auto, Snapdragon Compute, Snapdragon Connec
    39Monitor
  • CVE-2022-25657Memory corruption due to buffer overflow occurs while processing invalid MKV clip which has invalid seek header in Snapdragon Auto, Snapdrag
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2021-30295Sep 9, 2021 · Possible heap overflow due to improper validation of local variable while storing current task information locally in Snapdragon Auto, Snapd
    31Monitor
  • ← EarlierCVE-2021-1917Oct 20, 2021 · Null pointer dereference can occur due to memory allocation failure in DIAG in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity,
    33Monitor
  • Later →CVE-2021-1984Oct 20, 2021 · Possible buffer overflow due to improper validation of index value while processing the plugin block in Snapdragon Auto, Snapdragon Compute,
    31Monitor

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.
  • A low-privileged account is enough.
  • 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
Low
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:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

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

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

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(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.

ATT&CK techniques

—

Change log

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

References

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

All records