CVE-2021-30333

Memory corruption via unchecked EFS buffer size

Published Apr 1, 2022 · Updated Aug 3, 2024

Buffer overflow in Qualcomm Snapdragon modem EFS allows local users with low privileges to corrupt memory through a crafted EFS file. The modem copies data associated with an EFS file without validating that its buffer size fits the destination, causing an out-of-bounds write. Exploitation requires local low-privileged access; Qualcomm has not disclosed whether corruption produces a crash or attacker-controlled execution.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Qualcomm Snapdragon modem EFS allows local users with low privileges to corrupt memory through a crafted EFS file. The modem copies data associated with an EFS file without validating that its buffer size fits the destination, causing an out-of-bounds write. Exploitation requires local low-privileged access; Qualcomm has not disclosed whether corruption produces a crash or attacker-controlled execution.

The record

CVE
CVE-2021-30333
Published
Apr 1, 2022
Updated
Aug 3, 2024
Vendor
Qualcomm
Product
Snapdragon
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=APQ8009W, APQ8017, APQ8053, APQ8096AU, AQT1000, AR8035, CSRB31024, MDM8207, MDM9207, MDM9607, MDM9628, MDM9640, MSM8909W, MSM8953, MSM8996AU, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QCS6490, QCX315, QET4101, QSW8573, Qualcomm215, SA415M, SA515M, SD 675, SD 8 Gen1 5G, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD460, SD480, SD660, SD662, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD7c, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDA429W, SDM429W, SDW2500, SDX24, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6225, SM6250, SM6250P, SM6375, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9306, WCD9326, WCD9330, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3615, WCN3620, WCN3660B, WCN3680B, WCN3910, WCN3950 ...[truncated*]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Qualcomm · Snapdragonversion=APQ8009W, APQ8017, APQ8053, APQ8096AU, AQT1000, AR8035, CSRB31024, MDM8207, MDM9207, MDM9607, MDM9628, MDM9640, MSM8909W, MSM8953, MSM8996AU, QCA6174A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS410, QCS4290, QCS610, QCS6125, QCS6490, QCX315, QET4101, QSW8573, Qualcomm215, SA415M, SA515M, SD 675, SD 8 Gen1 5G, SD 8cx Gen2, SD205, SD210, SD429, SD439, SD460, SD480, SD660, SD662, SD665, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD7c, SD850, SD855, SD865 5G, SD870, SD888, SD888 5G, SDA429W, SDM429W, SDW2500, SDX24, SDX55, SDX55M, SDX65, SDXR1, SDXR2 5G, SM6225, SM6250, SM6250P, SM6375, SM7250P, SM7315, SM7325P, SW5100, SW5100P, WCD9306, WCD9326, WCD9330, WCD9335, WCD9340, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3615, WCN3620, WCN3660B, WCN3680B, WCN3910, WCN3950 ...[truncated*]

Published CVSS scores

7.8QualcommCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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.

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No observations available

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

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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