CVE-2024-27834 [Medium] | Denial of Service in Safari

The issue was addressed with improved checks. This issue is fixed in Safari 17.5, iOS 16.7.8 and iPadOS 16.7.8, iOS 17.5 and iPadOS 17.5, macOS Sonoma 14.5, tvOS 17.5, watchOS 10.5. An attacker with arbitrary read and write capability may be able to bypass Pointer Authentication.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.06%	0.01%	-0.05%
2	2025-11-18	0.04%	0.06%	+0.02%
3	2025-04-15	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.06%

0.01%

-0.05%

2025-11-18

0.04%

0.06%

+0.02%

2025-04-15

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	1.8	3.6	[email protected]
8.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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.	1.4	6.0	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

1.8

3.6

[email protected]

8.1

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.

1.4

6.0

134c704f-9b21-4f2e-91b3-4a467353bcc0

OS Trackers for CVE-2024-27834

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2024-27834 not yet assigned priority: Debian including 2 source packages (webkit2gtk, wpewebkit), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 2.	https://security-tracker.debian.org/tracker/CVE-2024-27834
`redhat`	high	—	https://access.redhat.com/security/cve/CVE-2024-27834
`suse`	high	CVE-2024-27834 severity important: SUSE including 144 source package names (WPEWebDriver-2.44.2-1.1, WebKitGTK-4.0-lang-2.46.0-150400.4.91.1, …), 462 product×package rows across 46 product lines (SUSE Enterprise Storage 7.1, SUSE Liberty Linux 8, … (46 product lines)): Fixed 404, Known Not Affected 58.	https://www.suse.com/security/cve/CVE-2024-27834/
`ubuntu`	medium	CVE-2024-27834 medium priority: Ubuntu including 5 source packages (qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk, wpewebkit), 33 status rows across 7 suites (bionic, focal, jammy, mantic, noble, upstream, xenial): ignored 16, DNE 10, released 4, needs-triage 3.	https://ubuntu.com/security/CVE-2024-27834

Affected software / configurations for CVE-2024-27834

Vendor	Product	Version	Raw CPE
apple	safari	< 17.5	cpe:2.3:a:apple:safari::::::::
apple	ipados	< 17.5	cpe:2.3:o:apple:ipados::::::::
apple	iphone_os	< 17.5	cpe:2.3:o:apple:iphone_os::::::::
apple	macos	>= 14.0, < 14.5	cpe:2.3:o:apple:macos::::::::
apple	tvos	< 17.5	cpe:2.3:o:apple:tvos::::::::
apple	watchos	< 10.5	cpe:2.3:o:apple:watchos::::::::
webkitgtk	webkitgtk	< 2.44.2	cpe:2.3:a:webkitgtk:webkitgtk::::::::
wpewebkit	wpe_webkit	< 2.44.2	cpe:2.3:a:wpewebkit:wpe_webkit::::::::
fedoraproject	fedora	39	cpe:2.3:o:fedoraproject:fedora:39:::::::*
fedoraproject	fedora	40	cpe:2.3:o:fedoraproject:fedora:40:::::::*

References for CVE-2024-27834

URL	Tags
https://support.apple.com/en-us/120896
https://support.apple.com/en-us/120898
https://support.apple.com/en-us/120901
https://support.apple.com/en-us/120902
https://support.apple.com/en-us/120903
https://support.apple.com/en-us/120905
http://seclists.org/fulldisclosure/2024/May/10	Mailing List
http://seclists.org/fulldisclosure/2024/May/12	Mailing List
http://seclists.org/fulldisclosure/2024/May/16	Mailing List
http://seclists.org/fulldisclosure/2024/May/17	Mailing List
http://seclists.org/fulldisclosure/2024/May/9	Mailing List
http://www.openwall.com/lists/oss-security/2024/05/21/1	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/ADCLQW54XN37VJZNYD3UKCYATJFIMYXG/	Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/WKIXADCW3O4R2OOSDZGPU55XQFE6NA3M/	Mailing List
https://support.apple.com/en-us/HT214101	Vendor Advisory
https://support.apple.com/en-us/HT214102	Vendor Advisory
https://support.apple.com/en-us/HT214103	Vendor Advisory
https://support.apple.com/en-us/HT214104	Vendor Advisory
https://support.apple.com/en-us/HT214106	Vendor Advisory
https://support.apple.com/kb/HT214100
https://support.apple.com/kb/HT214102
https://support.apple.com/kb/HT214104
https://support.apple.com/kb/HT214106

URL

CVE-2024-27834

Exploit prediction scoring system (EPSS) score for CVE-2024-27834

Common vulnerability scoring system (CVSS) metrics for CVE-2024-27834

Weakness enumeration for CVE-2024-27834

OS Trackers for CVE-2024-27834

Affected software / configurations for CVE-2024-27834

References for CVE-2024-27834