CVE-2022-27882Public exploit

Daemon crash via signed DNSSL label length

Published Mar 25, 2022 · Updated Aug 3, 2024

Heap-based buffer overflow in OpenBSD slaacd 6.9 and 7.0 before 2022-03-22 allows remote attackers to crash the daemon via IPv6. The parse_dnssl function reads an attacker-controlled label length into a signed integer, bypasses its bounds checks, and passes the negative value to memcpy as a huge unsigned size. The attacker must reach the target over its local IPv6 link; privilege separation and pledge confine the overflow to the unprivileged daemon, making code execution unlikely.

CVSS severity7.5
High
EPSS probability1.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in OpenBSD slaacd 6.9 and 7.0 before 2022-03-22 allows remote attackers to crash the daemon via IPv6. The parse_dnssl function reads an attacker-controlled label length into a signed integer, bypasses its bounds checks, and passes the negative value to memcpy as a huge unsigned size. The attacker must reach the target over its local IPv6 link; privilege separation and pledge confine the overflow to the unprivileged daemon, making code execution unlikely.

The record

CVE
CVE-2022-27882
Published
Mar 25, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-681, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV:N/AC:L/Au:N/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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