HIGHCVSS8.4
|Actively Exploited
|CISA KEV|CVE-2021-1905|Auth: none — unauthenticated|Reboot: required|Manual onlyQualcomm Multiple Chipsets Use-After-Free Vulnerability (CVE-2021-1905)
Multiple Qualcomm Chipsets contain a use after free vulnerability due to improper handling of memory mapping of multiple processes simultaneously.
Published May 7, 2021 · Updated May 17, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched
A local attacker, without authentication, can achieve full data confidentiality loss, arbitrary modification of data, complete denial of service or system unavailability. Federal agencies are required to remediate by 2022-05-03 under CISA BOD 22-01.
How the attack worksNo clicks needed
This is a Use After Free (CWE-416) vulnerability in Qualcomm Multiple Chipsets. Possible use after free due to improper handling of memory mapping of multiple processes simultaneously. in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables Exploitation requires local access, low attack complexity, no authentication required, and no user interaction required.
Am I affected?Quick check
Probably yes if any of these apply:
●IT Security
●Running apq8009 firmware: -; apq8009w firmware: -; apq8017 firmware: -; apq8053 firmware: -; apq8064au firmware: -; apq8096au firmware: -; aqt1000 firmware: -; ar8031 firmware: -; ar8035 firmware: -; ar8151 firmware: -; csra6620 firmware: -; csra6640 firmware: -; fsm10055 firmware: -; fsm10056 firmware: -; mdm9206 firmware: -; mdm9607 firmware: -; mdm9626 firmware: -; mdm9628 firmware: -; mdm9650 firmware: -; msm8909w firmware: -; msm8917 firmware: -; msm8953 firmware: -; msm8996au firmware: -; pm215 firmware: -; pm3003a firmware: -; pm4125 firmware: -; pm4250 firmware: -; pm439 firmware: -; pm456 firmware: -; pm6125 firmware: -; pm6150 firmware: -; pm6150a firmware: -; pm6150l firmware: -; pm6250 firmware: -; pm6350 firmware: -; pm640a firmware: -; pm640l firmware: -; pm640p firmware: -; pm660 firmware: -; pm660a firmware: -; pm660l firmware: -; pm670 firmware: -; pm670a firmware: -; pm670l firmware: -; pm7150a firmware: -; pm7150l firmware: -; pm7250 firmware: -; pm7250b firmware: -; pm8004 firmware: -; pm8005 firmware: -; pm8008 firmware: -; pm8009 firmware: -; pm8150 firmware: -; pm8150a firmware: -; pm8150b firmware: -; pm8150c firmware: -; pm8150l firmware: -; pm8250 firmware: -; pm8350 firmware: -; pm8350b firmware: -; pm8350bh firmware: -; pm8350c firmware: -; pm855 firmware: -; pm855a firmware: -; pm855b firmware: -; pm855l firmware: -; pm855p firmware: -; pm8909 firmware: -; pm8916 firmware: -; pm8937 firmware: -; pm8953 firmware: -; pm8998 firmware: -; pmc1000h firmware: -; pmd9607 firmware: -; pmd9655 firmware: -; pme605 firmware: -; pmi632 firmware: -; pmi8937 firmware: -; pmi8952 firmware: -; pmi8998 firmware: -; pmk8002 firmware: -; pmk8003 firmware: -; pmk8350 firmware: -; pmm6155au firmware: -; pmm8155au firmware: -; pmm8195au firmware: -; pmm855au firmware: -; pmm8920au firmware: -; pmm8996au firmware: -; pmr525 firmware: -; pmr735a firmware: -; pmr735b firmware: -; pmw3100 firmware: -; pmx20 firmware: -; pmx24 firmware: -; pmx50 firmware: -; pmx55 firmware: -; qat3514 firmware: -; qat3516 firmware: -; qat3518 firmware: -; qat3519 firmware: -; qat3522 firmware: -; qat3550 firmware: -; qat3555 firmware: -; qat5515 firmware: -; qat5516 firmware: -; qat5522 firmware: -; qat5533 firmware: -; qat5568 firmware: -; qbt1000 firmware: -; qbt1500 firmware: -; qbt2000 firmware: -; qca4020 firmware: -; qca6174 firmware: -; qca6174a firmware: -; qca6310 firmware: -; qca6320 firmware: -; qca6335 firmware: -; qca6390 firmware: -; qca6391 firmware: -; qca6420 firmware: -; qca6421 firmware: -; qca6426 firmware: -; qca6430 firmware: -; qca6431 firmware: -; qca6436 firmware: -; qca6564 firmware: -; qca6564a firmware: -; qca6564au firmware: -; qca6574 firmware: -; qca6574a firmware: -; qca6574au firmware: -; qca6584au firmware: -; qca6595au firmware: -; qca6696 firmware: -; qca8337 firmware: -; qca9367 firmware: -; qca9377 firmware: -; qca9379 firmware: -; qcc1110 firmware: -; qcm2290 firmware: -; qcm4290 firmware: -; qcm6125 firmware: -; qcs2290 firmware: -; qcs405 firmware: -; qcs410 firmware: -; qcs4290 firmware: -; qcs603 firmware: -; qcs605 firmware: -; qcs610 firmware: -; qcs6125 firmware: -; qdm2301 firmware: -; qdm2302 firmware: -; qdm2305 firmware: -; qdm2307 firmware: -; qdm2308 firmware: -; qdm2310 firmware: -; qdm3301 firmware: -; qdm4643 firmware: -; qdm4650 firmware: -; qdm5620 firmware: -; qdm5621 firmware: -; qdm5650 firmware: -; qdm5652 firmware: -; qdm5670 firmware: -; qdm5671 firmware: -; qdm5677 firmware: -; qdm5679 firmware: -; qet4100 firmware: -; qet4101 firmware: -; qet5100 firmware: -; qet5100m firmware: -; qet6100 firmware: -; qet6105 firmware: -; qet6110 firmware: -; qfe2101 firmware: -; qfe2520 firmware: -; qfe2550 firmware: -; qfe3100 firmware: -; qfe3340 firmware: -; qfe4301 firmware: -; qfe4302 firmware: -; qfe4303 firmware: -; qfe4305 firmware: -; qfe4308 firmware: -; qfe4309 firmware: -; qfe4320 firmware: -; qfe4373fc firmware: -; qfs2530 firmware: -; qfs2580 firmware: -; qfs2608 firmware: -; qfs2630 firmware: -; qln1020 firmware: -; qln1030 firmware: -; qln4640 firmware: -; qln4642 firmware: -; qln4650 firmware: -; qln5020 firmware: -; qln5030 firmware: -; qln5040 firmware: -; qpa2625 firmware: -; qpa4340 firmware: -; qpa4360 firmware: -; qpa4361 firmware: -; qpa5373 firmware: -; qpa5460 firmware: -; qpa5461 firmware: -; qpa5580 firmware: -; qpa5581 firmware: -; qpa6560 firmware: -; qpa8673 firmware: -; qpa8675 firmware: -; qpa8686 firmware: -; qpa8801 firmware: -; qpa8802 firmware: -; qpa8803 firmware: -; qpa8821 firmware: -; qpa8842 firmware: -; qpm2630 firmware: -; qpm4621 firmware: -; qpm4630 firmware: -; qpm4640 firmware: -; qpm4641 firmware: -; qpm4650 firmware: -; qpm5541 firmware: -; qpm5577 firmware: -; qpm5579 firmware: -; qpm5620 firmware: -; qpm5621 firmware: -; qpm5641 firmware: -; qpm5657 firmware: -; qpm5658 firmware: -; qpm5670 firmware: -; qpm5677 firmware: -; qpm5679 firmware: -; qpm5870 firmware: -; qpm5875 firmware: -; qpm6325 firmware: -; qpm6375 firmware: -; qpm6582 firmware: -; qpm6585 firmware: -; qpm6621 firmware: -; qpm6670 firmware: -; qpm8820 firmware: -; qpm8830 firmware: -; qpm8870 firmware: -; qpm8895 firmware: -; qsm7250 firmware: -; qsm8250 firmware: -; qsw6310 firmware: -; qsw8573 firmware: -; qsw8574 firmware: -; qtc410s firmware: -; qtc800h firmware: -; qtc800s firmware: -; qtc800t firmware: -; qtc801s firmware: -; qtm525 firmware: -; qtm527 firmware: -; qualcomm215 firmware: -; rgr7640au firmware: -; rsw8577 firmware: -; sa2150p firmware: -; sa515m firmware: -; sa6145p firmware: -; sa6150p firmware: -; sa6155 firmware: -; sa6155p firmware: -; sa8150p firmware: -; sa8155 firmware: -; sa8155p firmware: -; sa8195p firmware: -; sd455 firmware: -; sd636 firmware: -; sd675 firmware: -; sd8c firmware: -; sd8cx firmware: -; sd205 firmware: -; sd210 firmware: -; sd429 firmware: -; sd439 firmware: -; sd450 firmware: -; sd460 firmware: -; sd480 firmware: -; sd632 firmware: -; sd660 firmware: -; sd662 firmware: -; sd665 firmware: -; sd670 firmware: -; sd678 firmware: -; sd6905g firmware: -; sd710 firmware: -; sd720g firmware: -; sd730 firmware: -; sd750g firmware: -; sd765 firmware: -; sd765g firmware: -; sd768g firmware: -; sd835 firmware: -; sd845 firmware: -; sd855 firmware: -; sd8655g firmware: -; sd870 firmware: -; sd888 firmware: -; sd8885g firmware: -; sda429w firmware: -; sdm429w firmware: -; sdm630 firmware: -; sdm830 firmware: -; sdr051 firmware: -; sdr052 firmware: -; sdr425 firmware: -; sdr660 firmware: -; sdr660g firmware: -; sdr675 firmware: -; sdr735 firmware: -; sdr735g firmware: -; sdr8150 firmware: -; sdr8250 firmware: -; sdr845 firmware: -; sdr865 firmware: -; sdw2500 firmware: -; sdw3100 firmware: -; sdx20 firmware: -; sdx20m firmware: -; sdx24 firmware: -; sdx50m firmware: -; sdx55 firmware: -; sdx55m firmware: -; sdxr1 firmware: -; sdxr2 5g firmware: -; sm4125 firmware: -; sm6250 firmware: -; sm6250p firmware: -; sm7250p firmware: -; smb1350 firmware: -; smb1351 firmware: -; smb1354 firmware: -; smb1355 firmware: -; smb1357 firmware: -; smb1358 firmware: -; smb1360 firmware: -; smb1380 firmware: -; smb1381 firmware: -; smb1390 firmware: -; smb1395 firmware: -; smb1396 firmware: -; smb1398 firmware: -; smb231 firmware: -; smb2351 firmware: -; smb358s firmware: -; smr525 firmware: -; smr526 firmware: -; smr545 firmware: -; smr546 firmware: -; wcd9326 firmware: -; wcd9330 firmware: -; wcd9335 firmware: -; wcd9340 firmware: -; wcd9341 firmware: -; wcd9360 firmware: -; wcd9370 firmware: -; wcd9371 firmware: -; wcd9375 firmware: -; wcd9380 firmware: -; wcd9385 firmware: -; wcn3610 firmware: -; wcn3615 firmware: -; wcn3620 firmware: -; wcn3660 firmware: -; wcn3660b firmware: -; wcn3680 firmware: -; wcn3680b firmware: -; wcn3910 firmware: -; wcn3950 firmware: -; wcn3980 firmware: -; wcn3988 firmware: -; wcn3990 firmware: -; wcn3991 firmware: -; wcn3998 firmware: -; wcn3999 firmware: -; wcn6850 firmware: -; wcn6851 firmware: -; wcn6855 firmware: -; wcn6856 firmware: -; wgr7640 firmware: -; wsa8810 firmware: -; wsa8815 firmware: -; wsa8830 firmware: -; wsa8835 firmware: -; wtr2955 firmware: -; wtr2965 firmware: -; wtr3925 firmware: -; wtr4905 firmware: -; wtr5975 firmware: -; wtr6955 firmware: -
Real-world incidentsWhat we've seen
CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2021-11-03 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2022-05-03.
How to patch
Manual remediation steps
1
Identify affected hosts: query inventory for general installs in scope.
2
Apply the vendor security update referenced in CVE-2021-1905's advisory. No specific KB/version is encoded yet — consult the linked MSRC/vendor URL.
3
Verify the fix per the vendor's published verification steps.
4
Document the remediation in your change ticket and re-scan with your vulnerability scanner to confirm closure.
PowerShell automationComing soon
No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.