NVD / CVE Program· CNA qualcomm

CVE-2025-27071: Buffer Copy Without Checking Size of Input in Powerline Communication Firmware

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 39/100)

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: 0.21% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.
Severity is disputed: the assigning authority (CNA) scores it 7.3, NVD 9.8.

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

Memory corruption while processing specific files in Powerline Communication Firmware.

BDU:2025-12401

Published: Aug 6, 2025
Updated: Jun 17, 2026
EPSS: 0.2% · 11th percentile
CWE: CWE-120

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · qualcomm: 7.3; 2.5 point gap

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

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.

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.

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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	fastconnect 6800 firmware	cpe:2.3:o:qualcomm:fastconnect_6800_firmware
qualcomm	fastconnect 6800	cpe:2.3:h:qualcomm:fastconnect_6800
qualcomm	fastconnect 6900 firmware	cpe:2.3:o:qualcomm:fastconnect_6900_firmware
qualcomm	fastconnect 6900	cpe:2.3:h:qualcomm:fastconnect_6900
qualcomm	fastconnect 7800 firmware	cpe:2.3:o:qualcomm:fastconnect_7800_firmware
qualcomm	fastconnect 7800	cpe:2.3:h:qualcomm:fastconnect_7800
qualcomm	qca6391 firmware	cpe:2.3:o:qualcomm:qca6391_firmware
qualcomm	qca6391	cpe:2.3:h:qualcomm:qca6391
qualcomm	qca6426 firmware	cpe:2.3:o:qualcomm:qca6426_firmware
qualcomm	qca6426	cpe:2.3:h:qualcomm:qca6426
qualcomm	qca6436 firmware	cpe:2.3:o:qualcomm:qca6436_firmware
qualcomm	qca6436	cpe:2.3:h:qualcomm:qca6436

and 56 more

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
- FastConnect 6800, FastConnect 6900, FastConnect 7800, QCA6391, QCA6426, QCA6436, QSM8250, SD865 5G, SDM429W, SDX55, Snapdragon 429 Mobile Platform, Snapdragon 8 Gen 1 Mobile Platform … (+22)affected

Affected versions · NVD (20)

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

qualcomm fastconnect 6800 firmwareall versions
qualcomm fastconnect 6900 firmwareall versions
qualcomm fastconnect 7800 firmwareall versions
qualcomm qca6391 firmwareall versions
qualcomm qca6426 firmwareall versions
qualcomm qca6436 firmwareall versions
qualcomm qsm8250 firmwareall versions
qualcomm sd865 5g firmwareall versions
qualcomm sdm429w firmwareall versions
qualcomm sdx55 firmwareall versions
qualcomm snapdragon 429 mobile platform firmwareall versions
qualcomm snapdragon 8 gen 1 mobile platform firmwareall versions
qualcomm snapdragon 865 5g mobile platform firmwareall versions
qualcomm snapdragon 865+ 5g mobile platform (sm8250-ab) firmwareall versions
qualcomm snapdragon 870 5g mobile platform (sm8250-ac) firmwareall versions
qualcomm snapdragon w5+ gen 1 wearable platform firmwareall versions
qualcomm snapdragon x55 5g modem-rf system firmwareall versions
qualcomm snapdragon xr2 5g platform firmwareall versions
qualcomm sw5100 firmwareall versions
qualcomm sw5100p firmwareall versions

Same product

qualcomm: all records

Other highest-scoring records for the same primary product.

CVE-2023-28581Improper Restriction of Operations within the Bounds of a Memory Buffer in WLAN Firmware
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CVE-2025-27037Use After Free in Camera Driver
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CVE-2025-21474Use After Free in BTHOST
31Monitor

Published before and after this one in the same product

← EarlierCVE-2024-45566May 6, 2025 · Use After Free in Camera Driver
31Monitor
← EarlierCVE-2024-53016Jun 3, 2025 · Time-of-check Time-of-use (TOCTOU) Race Condition in Camera Driver
26Monitor
← EarlierCVE-2025-21455Aug 6, 2025 · Time-of-check Time-of-use (TOCTOU) Race Condition in Camera_Linux
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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is 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: Network
Attack complexity: Low
Privileges required: None
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:N/AC:L/PR:N/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

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 (0)

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

References

docs.qualcomm.com/product/publicresources/securitybulletin/august-2025-bulletin.html

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

All records