CVE-2021-45088 [Medium] | XSS in Epiphany

CVE-2021-45088 is rated Exploit Available (57.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.29%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-27	0.35%	0.29%	-0.07%
2	2025-11-21	1.05%	0.35%	-0.70%
3	2025-11-18	—	1.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-27

0.35%

0.29%

-0.07%

2025-11-21

1.05%

0.35%

-0.70%

2025-11-18

—

1.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

OS Trackers for CVE-2021-45088

vendor	priority	summary	link
`alpine`	medium	CVE-2021-45088: 1 source package rows (epiphany); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0.	https://security.alpinelinux.org/vuln/CVE-2021-45088
`debian`	not yet assigned	CVE-2021-45088 not yet assigned priority: Debian including 1 source packages (epiphany-browser), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2021-45088
`ubuntu`	medium	CVE-2021-45088 medium priority: Ubuntu including 1 source packages (epiphany-browser), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 8, ignored 3, needed 2, needs-triage 1, released 1.	https://ubuntu.com/security/CVE-2021-45088

Affected software / configurations for CVE-2021-45088

Vendor	Product	Version	Raw CPE
gnome	epiphany	< 40.4	cpe:2.3:a:gnome:epiphany::::::::
gnome	epiphany	>= 41.0, < 41.1	cpe:2.3:a:gnome:epiphany::::::::
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
debian	debian_linux	11.0	cpe:2.3:o:debian:debian_linux:11.0:::::::*

References for CVE-2021-45088

URL	Tags
https://gitlab.gnome.org/GNOME/epiphany/-/issues/1612	Exploit Vendor Advisory
https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1045	Patch Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/08/msg00006.html	Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5042	Third Party Advisory

URL

CVE-2021-45088

Public exploit references (Exploit-DB) for CVE-2021-45088

Exploit prediction scoring system (EPSS) score for CVE-2021-45088

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45088

Weakness enumeration for CVE-2021-45088

OS Trackers for CVE-2021-45088

Affected software / configurations for CVE-2021-45088

References for CVE-2021-45088