CVE-2025-27071Network attack vector

Memory corruption via unchecked SLAC group count

Published Aug 6, 2025 · Updated Aug 6, 2025

A stack-based buffer overflow in Qualcomm Snapdragon Powerline Communication Firmware allows remote attackers to corrupt memory via crafted SLAC messages. The EV parser passes an unvalidated NumGroups field to memcpy, while evse_cm_mnbc_sounds copies that count into a 58-byte stack buffer. Access to the charging-link network is required; the overwrite corrupts stack-resident data on either endpoint and can interrupt processing.

CVSS severity7.3
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack-based buffer overflow in Qualcomm Snapdragon Powerline Communication Firmware allows remote attackers to corrupt memory via crafted SLAC messages. The EV parser passes an unvalidated NumGroups field to memcpy, while evse_cm_mnbc_sounds copies that count into a 58-byte stack buffer. Access to the charging-link network is required; the overwrite corrupts stack-resident data on either endpoint and can interrupt processing.

The record

CVE
CVE-2025-27071
Published
Aug 6, 2025
Updated
Aug 6, 2025
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=FastConnect 6800
  2. Affected versionversion=FastConnect 6900
  3. Affected versionversion=FastConnect 7800
  4. Affected versionversion=QCA6391
  5. Affected versionversion=QCA6426
  6. Affected versionversion=QCA6436
  7. Affected versionversion=QSM8250
  8. Affected versionversion=SD865 5G
  9. Affected versionversion=SDM429W
  10. Affected versionversion=SDX55
  11. Affected versionversion=Snapdragon 429 Mobile Platform
  12. Affected versionversion=Snapdragon 865 5G Mobile Platform
  13. Affected versionversion=Snapdragon 865+ 5G Mobile Platform (SM8250-AB)
  14. Affected versionversion=Snapdragon 870 5G Mobile Platform (SM8250-AC)
  15. Affected versionversion=Snapdragon 8 Gen 1 Mobile Platform
  16. Affected versionversion=Snapdragon W5+ Gen 1 Wearable Platform
  17. Affected versionversion=Snapdragon X55 5G Modem-RF System
  18. Affected versionversion=Snapdragon XR2 5G Platform
  19. Affected versionversion=SW5100
  20. Affected versionversion=SW5100P
  21. Affected versionversion=SXR2130
  22. Affected versionversion=SXR2230P
  23. Affected versionversion=SXR2250P
  24. Affected versionversion=WCD9380
  25. Affected versionversion=WCD9385
  26. Affected versionversion=WCN3620
  27. Affected versionversion=WCN3660B
  28. Affected versionversion=WCN3980
  29. Affected versionversion=WCN3988
  30. Affected versionversion=WSA8810
  31. Affected versionversion=WSA8815
  32. Affected versionversion=WSA8830
  33. Affected versionversion=WSA8832
  34. Affected versionversion=WSA8835

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Qualcomm · Snapdragonversion=FastConnect 6800; version=FastConnect 6900; version=FastConnect 7800; version=QCA6391; version=QCA6426; version=QCA6436; version=QSM8250; version=SD865 5G; version=SDM429W; version=SDX55; version=Snapdragon 429 Mobile Platform; version=Snapdragon 865 5G Mobile Platform; version=Snapdragon 865+ 5G Mobile Platform (SM8250-AB); version=Snapdragon 870 5G Mobile Platform (SM8250-AC); version=Snapdragon 8 Gen 1 Mobile Platform; version=Snapdragon W5+ Gen 1 Wearable Platform; version=Snapdragon X55 5G Modem-RF System; version=Snapdragon XR2 5G Platform; version=SW5100; version=SW5100P; version=SXR2130; version=SXR2230P; version=SXR2250P; version=WCD9380; version=WCD9385; version=WCN3620; version=WCN3660B; version=WCN3980; version=WCN3988; version=WSA8810; version=WSA8815; version=WSA8830; version=WSA8832; version=WSA8835

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3Qualcomm, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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