CVE-2011-3631 [High] | Integer Overflow in Hardlink

Hardlink before 0.1.2 has multiple integer overflows leading to heap-based buffer overflows because of the way string lengths concatenation is done in the calculation of the required memory space to be used. A remote attacker could provide a specially-crafted directory tree and trick the local user into consolidating it, leading to hardlink executable crash or potentially arbitrary code execution with user privileges.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	4.15%	2.69%	-1.46%
2	2025-04-06	1.86%	4.15%	+2.30%
3	2025-03-30	—	1.86%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

4.15%

2.69%

-1.46%

2025-04-06

1.86%

4.15%

+2.30%

2025-03-30

—

1.86%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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.	2.8	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/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:M) Exploitation needs some favorable conditions, but not exceptional ones. 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.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.

2.8

5.9

[email protected]

6.8

2.0

MEDIUM

AV:N/AC:M/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:M): Exploitation needs some favorable conditions, but not exceptional ones.
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.

8.6

6.4

[email protected]

OS Trackers for CVE-2011-3631

vendor	priority	summary	link
`debian`	unimportant	CVE-2011-3631 unimportant priority: Debian including 1 source packages (hardlink), 1 status rows across 1 suites (bullseye): resolved 1.	https://security-tracker.debian.org/tracker/CVE-2011-3631
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2011-3631
`ubuntu`	low	CVE-2011-3631 low priority: Ubuntu including 1 source packages (hardlink), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): not-affected 5, DNE 1.	https://ubuntu.com/security/CVE-2011-3631

Affected software / configurations for CVE-2011-3631

Vendor	Product	Version	Raw CPE
hardlink_project	hardlink	< 0.1.2	cpe:2.3:a:hardlink_project:hardlink::::::::
debian	debian_linux	8.0	cpe:2.3:o:debian:debian_linux:8.0:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
redhat	enterprise_linux	5.0	cpe:2.3:o:redhat:enterprise_linux:5.0:::::::*
redhat	enterprise_linux	6.0	cpe:2.3:o:redhat:enterprise_linux:6.0:::::::*

References for CVE-2011-3631

URL	Tags
https://access.redhat.com/security/cve/cve-2011-3631	Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=645516	Issue Tracking Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-3631	Issue Tracking Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2011-3631	Third Party Advisory

URL

CVE-2011-3631

Exploit prediction scoring system (EPSS) score for CVE-2011-3631

Common vulnerability scoring system (CVSS) metrics for CVE-2011-3631

Weakness enumeration for CVE-2011-3631

OS Trackers for CVE-2011-3631

Affected software / configurations for CVE-2011-3631

References for CVE-2011-3631