CVE-2021-34693

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

0.47% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 40.5% of scored records. A rank, not a probability.

NVD base score

5.5 (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:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

Red Hat severity

Moderate. 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.

Published

2021-06-14 00:00Z5 YR AGO

Last updated

2026-10-08 21:03Z20 DAYS AGO

Reserved

2021-06-14

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-909Missing Initialization of ResourceClass
• CWE-908Use of Uninitialized ResourceBase

Data version

5.2

Document digest

5bc484b493bd426f417968bfc433b0cd2284d223e556d5464c90742603e9d65a

• lore.kernel.orghttps://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/
• www.openwall.com[oss-security] 20210615 CVE-2021-34693: Infoleak in CAN BCM protocol in Linux kernelhttp://www.openwall.com/lists/oss-security/2021/06/15/1mailing-list
• lists.debian.org[debian-lts-announce] 20210720 [SECURITY] [DLA 2713-2] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/07/msg00016.htmlmailing-list
• lists.debian.org[debian-lts-announce] 20210720 [SECURITY] [DLA 2713-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/07/msg00014.htmlmailing-list
• lists.debian.org[debian-lts-announce] 20210720 [SECURITY] [DLA 2714-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/07/msg00015.htmlmailing-list
• www.debian.orgDSA-4941https://www.debian.org/security/2021/dsa-4941vendor-advisory
• git.kernel.orghttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc