CVE-2020-12141Network attack vector

Service interruption and disclosure via unchecked BER length

Published Oct 19, 2021 · Updated Aug 4, 2024

Out-of-bounds read in the Contiki-NG SNMP stack 4.4 and earlier allows remote attackers to interrupt service or disclose memory. The snmp_ber_decode_string_len_buffer function decodes a packet-supplied string length without verifying sufficient input remains. SNMP must be enabled and reachable; malformed packets can read beyond the message boundary, interrupting the service and exposing adjacent memory.

CVSS severity9.1
Critical
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Contiki-NG SNMP stack 4.4 and earlier allows remote attackers to interrupt service or disclose memory. The snmp_ber_decode_string_len_buffer function decodes a packet-supplied string length without verifying sufficient input remains. SNMP must be enabled and reachable; malformed packets can read beyond the message boundary, interrupting the service and exposing adjacent memory.

The record

CVE
CVE-2020-12141
Published
Oct 19, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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