CVE-2019-5882 [Critical] | Use-After-Free in Irssi

CVE-2019-5882 is rated High Risk (70.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.54%). EPSS rose +2.00% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.54%	2.54%	+2.00%
2	2025-11-21	0.72%	0.54%	-0.17%
3	2025-11-18	—	0.72%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.54%

2.54%

+2.00%

2025-11-21

0.72%

0.54%

-0.17%

2025-11-18

—

0.72%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.0	CRITICAL	`CVSS:3.0/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]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.0

CRITICAL

CVSS:3.0/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]

7.5

2.0

HIGH

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

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

OS Trackers for CVE-2019-5882

vendor	priority	summary	link
`alpine`	critical	CVE-2019-5882: 1 source package rows (irssi); 14 state rows across 11 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community, edge-main); fixed 11, open 3.	https://security.alpinelinux.org/vuln/CVE-2019-5882
`debian`	not yet assigned	CVE-2019-5882 not yet assigned priority: Debian including 1 source packages (irssi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2019-5882
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2019-5882
`ubuntu`	medium	CVE-2019-5882 medium priority: Ubuntu including 1 source packages (irssi), 5 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): released 5.	https://ubuntu.com/security/CVE-2019-5882

Affected software / configurations for CVE-2019-5882

Vendor	Product	Version	Raw CPE
irssi	irssi	>= 1.1.0, < 1.1.2	cpe:2.3:a:irssi:irssi::::::::
canonical	ubuntu_linux	14.04	cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::
canonical	ubuntu_linux	16.04	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
canonical	ubuntu_linux	18.04	cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
canonical	ubuntu_linux	18.10	cpe:2.3:o:canonical:ubuntu_linux:18.10:::::::*

References for CVE-2019-5882

URL	Tags
https://github.com/irssi/irssi/pull/948	Patch Third Party Advisory
https://irssi.org/NEWS/#v1-1-2	Vendor Advisory
https://irssi.org/security/irssi_sa_2019_01.txt	Vendor Advisory
https://usn.ubuntu.com/3862-1/	Third Party Advisory

URL

CVE-2019-5882

Exploit prediction scoring system (EPSS) score for CVE-2019-5882

Common vulnerability scoring system (CVSS) metrics for CVE-2019-5882

Weakness enumeration for CVE-2019-5882

OS Trackers for CVE-2019-5882

Affected software / configurations for CVE-2019-5882

References for CVE-2019-5882