Service interruption via invalid LTE response length
Published Aug 6, 2025 · Updated Aug 6, 2025
Reachable assertion in Qualcomm Snapdragon modem firmware allows remote attackers to interrupt service via an invalid LTE RAR PDU length. The modem processes the malformed random-access response instead of rejecting its invalid length, reaches an assertion, and causes a transient denial of service. The attacker must reach the device over an LTE network; the published impact is limited to temporary availability loss, not data access or modification.
Summary
What happened
Reachable assertion in Qualcomm Snapdragon modem firmware allows remote attackers to interrupt service via an invalid LTE RAR PDU length. The modem processes the malformed random-access response instead of rejecting its invalid length, reaches an assertion, and causes a transient denial of service. The attacker must reach the device over an LTE network; the published impact is limited to temporary availability loss, not data access or modification.
The record
- CVE
- CVE-2025-21452
- Published
- Aug 6, 2025
- Updated
- Aug 6, 2025
- Vendor
- Qualcomm
- Product
- Snapdragon
- Classifications
- CWE-617, T1642
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2025CVE publishedPublication date reported by the CVE source.
- Aug 6, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=315 5G IoT Modem
- Affected versionversion=AR8035
- Affected versionversion=FastConnect 6200
- Affected versionversion=FastConnect 6700
- Affected versionversion=FastConnect 6800
- Affected versionversion=FastConnect 6900
- Affected versionversion=FSM10055
- Affected versionversion=QCA6174A
- Affected versionversion=QCA6391
- Affected versionversion=QCA6421
- Affected versionversion=QCA6426
- Affected versionversion=QCA6431
- Affected versionversion=QCA6436
- Affected versionversion=QCA6574A
- Affected versionversion=QCA6574AU
- Affected versionversion=QCA6595AU
- Affected versionversion=QCA6696
- Affected versionversion=QCA6698AQ
- Affected versionversion=QCA8337
- Affected versionversion=QCM5430
- Affected versionversion=QCM6490
- Affected versionversion=QCS5430
- Affected versionversion=QCS6490
- Affected versionversion=QEP8111
- Affected versionversion=Qualcomm Video Collaboration VC3 Platform
- Affected versionversion=SD855
- Affected versionversion=SD865 5G
- Affected versionversion=SDX55
- Affected versionversion=SDX57M
- Affected versionversion=SM6370
- Affected versionversion=SM6650
- Affected versionversion=SM7250P
- Affected versionversion=SM7325P
- Affected versionversion=SM7635
- Affected versionversion=Snapdragon 480 5G Mobile Platform
- Affected versionversion=Snapdragon 480+ 5G Mobile Platform (SM4350-AC)
- Affected versionversion=Snapdragon 4 Gen 1 Mobile Platform
- Affected versionversion=Snapdragon 690 5G Mobile Platform
- Affected versionversion=Snapdragon 695 5G Mobile Platform
- Affected versionversion=Snapdragon 765 5G Mobile Platform (SM7250-AA)
- Affected versionversion=Snapdragon 765G 5G Mobile Platform (SM7250-AB)
- Affected versionversion=Snapdragon 768G 5G Mobile Platform (SM7250-AC)
- Affected versionversion=Snapdragon 778G 5G Mobile Platform
- Affected versionversion=Snapdragon 778G+ 5G Mobile Platform (SM7325-AE)
- Affected versionversion=Snapdragon 780G 5G Mobile Platform
- Affected versionversion=Snapdragon 782G Mobile Platform (SM7325-AF)
- Affected versionversion=Snapdragon 7c+ Gen 3 Compute
- Affected versionversion=Snapdragon 855+/860 Mobile Platform (SM8150-AC)
- Affected versionversion=Snapdragon 855 Mobile Platform
- Affected versionversion=Snapdragon 865 5G Mobile Platform
- Affected versionversion=Snapdragon 865+ 5G Mobile Platform (SM8250-AB)
- Affected versionversion=Snapdragon 870 5G Mobile Platform (SM8250-AC)
- Affected versionversion=Snapdragon 888 5G Mobile Platform
- Affected versionversion=Snapdragon 888+ 5G Mobile Platform (SM8350-AC)
- Affected versionversion=Snapdragon Auto 5G Modem-RF
- Affected versionversion=Snapdragon X35 5G Modem-RF System
- Affected versionversion=Snapdragon X55 5G Modem-RF System
- Affected versionversion=Snapdragon XR2 5G Platform
- Affected versionversion=SXR2130
- Affected versionversion=WCD9340
- Affected versionversion=WCD9341
- Affected versionversion=WCD9360
- Affected versionversion=WCD9370
- Affected versionversion=WCD9375
- Affected versionversion=WCD9378
- Affected versionversion=WCD9380
- Affected versionversion=WCD9385
- Affected versionversion=WCD9395
- Affected versionversion=WCN3988
- Affected versionversion=WCN6450
- Affected versionversion=WCN6650
- Affected versionversion=WCN6740
- Affected versionversion=WCN6755
- Affected versionversion=WCN7861
- Affected versionversion=WCN7881
- Affected versionversion=WSA8810
- Affected versionversion=WSA8815
- Affected versionversion=WSA8830
- Affected versionversion=WSA8832
- Affected versionversion=WSA8835
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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