Skip to content
Noroxi
NVD / CVE Program· CNA qualcomm

CVE-2021-30306: Possible buffer over read due to improper buffer allocation for file length passed from user space in Snapdragon Auto, Snapdragon Connectivi

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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. 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 over read due to improper buffer allocation for file length passed from user space in Snapdragon Auto, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

HighCVSS 7.1 · v3.1—No exploit No fix recorded
Published
Oct 20, 2021
Updated
Jun 16, 2026
EPSS
0.1% · 4th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
7.1
CNA · qualcomm
8.4
1.3 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-2021-30306

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for qualcomm records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
qualcommapq8053 firmware
qualcommapq8053
qualcommmsm8953 firmware
qualcommmsm8953
qualcommqca6174a firmware
qualcommqca6174a
qualcommqca6390 firmware
qualcommqca6390
qualcommqca6391 firmware
qualcommqca6391
qualcommqca6426 firmware
qualcommqca6426

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 apq8053 firmwareall versions
  • qualcomm msm8953 firmwareall versions
  • qualcomm qca6174a firmwareall versions
  • qualcomm qca6390 firmwareall versions
  • qualcomm qca6391 firmwareall versions
  • qualcomm qca6426 firmwareall versions
  • qualcomm qca6574 firmwareall versions
  • qualcomm qca6574a firmwareall versions
  • qualcomm qca6574au firmwareall versions
  • qualcomm qca6595au firmwareall versions
  • qualcomm qca6696 firmwareall versions
  • qualcomm qca9377 firmwareall versions
  • qualcomm qcm6490 firmwareall versions
  • qualcomm qcs6490 firmwareall versions
  • qualcomm qrb5165 firmwareall versions
  • qualcomm sa6145p firmwareall versions
  • qualcomm sa6150p firmwareall versions
  • qualcomm sa6155 firmwareall versions
  • qualcomm sa6155p firmwareall versions
  • qualcomm sa8145p 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 Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

    • APQ8053, MSM8953, QCA6174A, QCA6390, QCA6391, QCA6426, QCA6574, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA9377, QCM6490, QCS6490, QRB5165, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155affected

Same product

qualcomm: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-22071Possible use after free when process shell memory is freed using IOCTL munmap call and process initialization is in progress in Snapdragon AKEV
    61This week
  • CVE-2020-11264Improper authentication of Non-EAPOL/WAPI plaintext frames during four-way handshake can lead to arbitrary network packet injection in Snapd
    43Plan
  • CVE-2020-11153u'Out of bound memory access while processing GATT data received due to lack of check of pdu data length and leads to remote code execution'
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2021-1948Sep 9, 2021 · Possible out of bound read due to lack of length check of data while parsing the beacon or probe response in Snapdragon Auto, Snapdragon Com
    30Monitor
  • ← EarlierCVE-2021-1980Oct 20, 2021 · Possible buffer over read due to lack of length check while parsing beacon IE response in Snapdragon Auto, Snapdragon Compute, Snapdragon Co
    36Monitor
  • Later →CVE-2021-30312Oct 20, 2021 · Improper authentication of sub-frames of a multicast AMSDU frame can lead to information disclosure in Snapdragon Auto, Snapdragon Compute,
    30Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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
none
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
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

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