01 Record

CVE-2021-4439

isdn: cpai: check ctr->cnr to avoid array index out of bound

UnratedPUBLISHEDCNA: Linux

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

isdn: cpai: check ctr->cnr to avoid array index out of bound

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 14.6% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-06-20 12:07Z2 YR AGO

Last updated

2026-05-11 13:43Z3 MO AGO

Reserved

2024-06-20

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-129Improper Validation of Array IndexVariant
CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

8652f52995c578506785497ba0304d0145c2f00b11337ff35ee0794b765dfc05

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < e8b8de17e164c9f1b7777f1c6f99d05539000036, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 24219a977bfe3d658687e45615c70998acdbac5a, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 9b6b2db77bc3121fe435f1d4b56e34de443bec75, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7d91adc0ccb060ce564103315189466eb822cc6a, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 285e9210b1fab96a11c0be3ed5cea9dd48b6ac54, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7f221ccbee4ec662e2292d490a43ce6c314c4594, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < cc20226e218a2375d50dd9ac14fb4121b43375ff, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1f3e2e97c003f80c4b087092b225c8787ff91e4d, 2.6.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036
git.kernel.orghttps://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a
git.kernel.orghttps://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75
git.kernel.orghttps://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a
git.kernel.orghttps://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54
git.kernel.orghttps://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594
git.kernel.orghttps://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff
git.kernel.orghttps://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d

01 Record index

CVE-2021-4439

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-4439

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References