CVE-2020-29362 [Medium] | Out-of-bounds Read in P11-Kit

An issue was discovered in p11-kit 0.21.1 through 0.23.21. A heap-based buffer over-read has been discovered in the RPC protocol used by thep11-kit server/remote commands and the client library. When the remote entity supplies a byte array through a serialized PKCS#11 function call, the receiving entity may allow the reading of up to 4 bytes of memory past the heap allocation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.34%	0.08%	-0.25%
2	2025-11-18	0.07%	0.34%	+0.27%
3	2025-03-30	—	0.07%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.34%

0.08%

-0.25%

2025-11-18

0.07%

0.34%

+0.27%

2025-03-30

—

0.07%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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: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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	3.9	1.4	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:P/I:N/A:N` 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:N) No integrity impact. Availability impact (A:N) No availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.3

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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: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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

3.9

1.4

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N 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:N): No integrity impact.
Availability impact (A:N): No availability impact.

10.0

2.9

[email protected]

OS Trackers for CVE-2020-29362

vendor	priority	summary	link
`alpine`	medium	CVE-2020-29362: 1 source package rows (p11-kit); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0.	https://security.alpinelinux.org/vuln/CVE-2020-29362
`debian`	not yet assigned	CVE-2020-29362 not yet assigned priority: Debian including 1 source packages (p11-kit), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-29362
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2020-29362
`suse`	medium	CVE-2020-29362 severity moderate: SUSE including 329 source package names (1.0.1-build4.16.1:libp11-kit0-0.23.2-150000.4.16.1, 1.0.1-build4.16.1:p11-kit-0.23.2-150000.4.16.1, …), 614 product×package rows across 100 product lines (Container bci/python, Container caasp/v4/cilium, … (100 product lines)): Fixed 321, Known Affected 193, Known Not Affected 100.	https://www.suse.com/security/cve/CVE-2020-29362/
`ubuntu`	medium	CVE-2020-29362 medium priority: Ubuntu including 1 source packages (p11-kit), 9 status rows across 9 suites (bionic, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): released 8, not-affected 1.	https://ubuntu.com/security/CVE-2020-29362

Affected software / configurations for CVE-2020-29362

Vendor	Product	Version	Raw CPE
p11-kit_project	p11-kit	>= 0.23.6, < 0.23.22	cpe:2.3:a:p11-kit_project:p11-kit::::::::

References for CVE-2020-29362

URL	Tags
https://github.com/p11-glue/p11-kit/releases	Release Notes Third Party Advisory
https://github.com/p11-glue/p11-kit/security/advisories/GHSA-5wpq-43j2-6qwc	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/01/msg00002.html	Mailing List Third Party Advisory
https://www.debian.org/security/2021/dsa-4822	Third Party Advisory

URL

CVE-2020-29362

Exploit prediction scoring system (EPSS) score for CVE-2020-29362

Common vulnerability scoring system (CVSS) metrics for CVE-2020-29362

Weakness enumeration for CVE-2020-29362

OS Trackers for CVE-2020-29362

Affected software / configurations for CVE-2020-29362

References for CVE-2020-29362