CVE-2020-20262Public exploitNetwork attack vector

Authenticated IPsec process crash via reachable assertion

Published Jul 21, 2021 · Updated Aug 4, 2024

Assertion failure in the IPsec process in MikroTik RouterOS before 6.47 allows remote authenticated users to crash the process via a crafted packet. The /ram/pckg/security/nova/bin/ipsec process contains an assertion reachable through attacker-controlled packet data, and violating it terminates the process with signal 6. An authenticated RouterOS session is required; the demonstrated consequence is interruption of IPsec rather than device compromise.

CVSS severity6.5
Medium
EPSS probability2.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Assertion failure in the IPsec process in MikroTik RouterOS before 6.47 allows remote authenticated users to crash the process via a crafted packet. The /ram/pckg/security/nova/bin/ipsec process contains an assertion reachable through attacker-controlled packet data, and violating it terminates the process with signal 6. An authenticated RouterOS session is required; the demonstrated consequence is interruption of IPsec rather than device compromise.

The record

CVE
CVE-2020-20262
Published
Jul 21, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 21, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo