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MitreCVE-2021-38311

HistoryAug 09, 2021 - 10:15 p.m.

CVE-2021-38311

2021-08-0922:15:08

CWE-835

mitre

web.nvd.nist.gov

contiki 3.0

telnet service

denial of service

cpu consumption

cve-2021-38311

nvd

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.5

Confidence

High

EPSS

0.001

Percentile

35.3%

JSON

In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption.

Affected configurations

Nvd

Node

contiki-oscontikiMatch3.0

VendorProductVersionCPE
contiki-oscontiki3.0cpe:2.3:o:contiki-os:contiki:3.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
contiki-os	contiki	3.0	cpe:2.3:o:contiki-os:contiki:3.0:::::::*

References

github.com/contiki-os/contiki/issues/2685

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

AI Score

7.5

Confidence

High

EPSS

0.001

Percentile

35.3%

JSON

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