CVE-2023-30800Public exploitNetwork attack vector

Web interface crash via JSProxy heap corruption

Published Sep 7, 2023 · Updated Nov 21, 2025

Heap corruption in MikroTik RouterOS 6 allows remote attackers to crash the web interface with a crafted HTTP request. The unauthenticated POST body reaches JSProxyServlet::doPost at /jsproxy, where processing corrupts heap memory and fails in malloc. Successful triggering returns an empty reply and restarts only the web interface service; no confidentiality or integrity impact is reported.

CVSS severity7.5
High
EPSS probability1.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap corruption in MikroTik RouterOS 6 allows remote attackers to crash the web interface with a crafted HTTP request. The unauthenticated POST body reaches JSProxyServlet::doPost at /jsproxy, where processing corrupts heap memory and fails in malloc. Successful triggering returns an empty reply and restarts only the web interface service; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2023-30800
Published
Sep 7, 2023
Updated
Nov 21, 2025
Vendor
MikroTik
Product
RouterOS
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.48.8
  2. Affected versionversion=6.49.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MikroTik · RouterOSversion=6.48.8; version=6.49.9

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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

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Your stack

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