CVE-2025-27071 [High] | Security Vulnerability in Fastconnect 6800 Firmware

CVE-2025-27071 is rated Low Risk (31.4/100): CVSS High severity, with low exploitation likelihood (EPSS 0.17%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.32%	0.17%	-0.15%
2	2026-06-02	0.05%	0.32%	+0.27%
3	2026-04-11	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.32%

0.17%

-0.15%

2026-06-02

0.05%

0.32%

+0.27%

2026-04-11

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.3	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	3.4	[email protected]
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.3

3.1

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

3.4

[email protected]

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

Affected software / configurations for CVE-2025-27071

Vendor	Product	Version	Raw CPE
qualcomm	fastconnect_6800_firmware	—	cpe:2.3:o:qualcomm:fastconnect_6800_firmware:-:::::::*
qualcomm	fastconnect_6900_firmware	—	cpe:2.3:o:qualcomm:fastconnect_6900_firmware:-:::::::*
qualcomm	fastconnect_7800_firmware	—	cpe:2.3:o:qualcomm:fastconnect_7800_firmware:-:::::::*
qualcomm	qca6391_firmware	—	cpe:2.3:o:qualcomm:qca6391_firmware:-:::::::*
qualcomm	qca6426_firmware	—	cpe:2.3:o:qualcomm:qca6426_firmware:-:::::::*
qualcomm	qca6436_firmware	—	cpe:2.3:o:qualcomm:qca6436_firmware:-:::::::*
qualcomm	qsm8250_firmware	—	cpe:2.3:o:qualcomm:qsm8250_firmware:-:::::::*
qualcomm	sd865_5g_firmware	—	cpe:2.3:o:qualcomm:sd865_5g_firmware:-:::::::*
qualcomm	sdm429w_firmware	—	cpe:2.3:o:qualcomm:sdm429w_firmware:-:::::::*
qualcomm	sdx55_firmware	—	cpe:2.3:o:qualcomm:sdx55_firmware:-:::::::*
qualcomm	snapdragon_429_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_429_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_8_gen_1_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_gen_1_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_865_5g_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_865_5g_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_865\+_5g_mobile_platform_\(sm8250-ab\)_firmware	—	cpe:2.3:o:qualcomm:snapdragon_865\+_5g_mobile_platform_\(sm8250-ab\)_firmware:-:::::::*
qualcomm	snapdragon_870_5g_mobile_platform_\(sm8250-ac\)_firmware	—	cpe:2.3:o:qualcomm:snapdragon_870_5g_mobile_platform_\(sm8250-ac\)_firmware:-:::::::*
qualcomm	snapdragon_w5\+_gen_1_wearable_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_w5\+_gen_1_wearable_platform_firmware:-:::::::*
qualcomm	snapdragon_x55_5g_modem-rf_system_firmware	—	cpe:2.3:o:qualcomm:snapdragon_x55_5g_modem-rf_system_firmware:-:::::::*
qualcomm	snapdragon_xr2_5g_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_xr2_5g_platform_firmware:-:::::::*
qualcomm	sw5100_firmware	—	cpe:2.3:o:qualcomm:sw5100_firmware:-:::::::*
qualcomm	sw5100p_firmware	—	cpe:2.3:o:qualcomm:sw5100p_firmware:-:::::::*
qualcomm	sxr2130_firmware	—	cpe:2.3:o:qualcomm:sxr2130_firmware:-:::::::*
qualcomm	sxr2230p_firmware	—	cpe:2.3:o:qualcomm:sxr2230p_firmware:-:::::::*
qualcomm	sxr2250p_firmware	—	cpe:2.3:o:qualcomm:sxr2250p_firmware:-:::::::*
qualcomm	wcd9380_firmware	—	cpe:2.3:o:qualcomm:wcd9380_firmware:-:::::::*
qualcomm	wcd9385_firmware	—	cpe:2.3:o:qualcomm:wcd9385_firmware:-:::::::*
qualcomm	wcn3620_firmware	—	cpe:2.3:o:qualcomm:wcn3620_firmware:-:::::::*
qualcomm	wcn3660b_firmware	—	cpe:2.3:o:qualcomm:wcn3660b_firmware:-:::::::*
qualcomm	wcn3980_firmware	—	cpe:2.3:o:qualcomm:wcn3980_firmware:-:::::::*
qualcomm	wcn3988_firmware	—	cpe:2.3:o:qualcomm:wcn3988_firmware:-:::::::*
qualcomm	wsa8810_firmware	—	cpe:2.3:o:qualcomm:wsa8810_firmware:-:::::::*
qualcomm	wsa8815_firmware	—	cpe:2.3:o:qualcomm:wsa8815_firmware:-:::::::*
qualcomm	wsa8830_firmware	—	cpe:2.3:o:qualcomm:wsa8830_firmware:-:::::::*
qualcomm	wsa8832_firmware	—	cpe:2.3:o:qualcomm:wsa8832_firmware:-:::::::*
qualcomm	wsa8835_firmware	—	cpe:2.3:o:qualcomm:wsa8835_firmware:-:::::::*

References for CVE-2025-27071

URL	Tags
https://docs.qualcomm.com/product/publicresources/securitybulletin/august-2025-bulletin.html	Vendor Advisory

URL

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

Exploit prediction scoring system (EPSS) score for CVE-2025-27071

Common vulnerability scoring system (CVSS) metrics for CVE-2025-27071

Weakness enumeration for CVE-2025-27071

Affected software / configurations for CVE-2025-27071

References for CVE-2025-27071