Is CVE-2011-5321 in the CISA KEV catalog?

No. CVE-2011-5321 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-5321?

CVE-2011-5321 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2011-5321?

CVE-2011-5321 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-5321?

Upgrade linux on debian 11 to 3.2.20-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-5321

MEDIUM

5.5

CVSS v3

NVD

Description

The tty_open function in drivers/tty/tty_io.c in the Linux kernel before 3.1.1 mishandles a driver-lookup failure, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via crafted access to a device file under the /dev/pts directory.

How to fix

Remediation Available

linuxDebian

Fixed in:3.2.20-1CVE-2011-5321

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory2

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.