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CVE mentions, exploit signals, and PoC evidence in one fast public view.

CVE detail

CVE-2026-65421

The MMS BER decoder contains a flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplied length value is not validated, causing a read past the end of a heap buffer. This leads to termination of the MMS service process and a denial-of-service condition.

CVSS 7.1 · HighBuzz score 21.0

Buzz score

Why this CVE is surfacing

Buzz score total 21.0

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 11.0 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
11.0
2 evidence mentions in the snapshot
Diversity score
10.0
2 sources across 2 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
2
within the 30d window
Peak daily
2
highest bucket

Evidence

Source links by recency

Newest mentions first
2 source links · newest first
  • https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.jsongithub.com

    No excerpt available.

    Exploitgithub.comJul 30, 2026, 11:16 PM
  • MZ Automation GmbH libiec61850CISA Alerts

    ice condition on the device. The following versions of MZ Automation GmbH libiec61850 are affected: libiec61850 <1.6.2 (CVE-2026-66720, CVE-2026-66369, CVE-2026-63550, CVE-2026-65421, CVE-2026-66364, CVE-2026-66349, CVE-2026-56758, CVE-2026-66360) CVSS Vendor Equipment Vulnerabilities v3 7.5 MZ Automation GmbH MZ Automation GmbH libiec61850 Out-of-boun

    governmentwww.cisa.govJul 30, 2026, 12:00 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

Similar CVEs

6 related CVEs with shared weakness or product evidence
  • CVE-2026-66720

    The GOOSE subscriber component improperly validates the UTC timestamp field in unauthenticated IEC 61850 GOOSE (EtherType 0x88B8) Layer-2 multicast messages. A specially crafted…

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  • CVE-2026-66369

    The GOOSE parser contains an off-by-one boundary-handling flaw that can be triggered by a single unauthenticated Layer-2 multicast frame on the process bus. When specific GOOSE…

    CVSS 7.1 · High
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  • CVE-2026-66364

    The GOOSE payload parser contains a boundary handling flaw that can be triggered by a single unauthenticated Layer 2 multicast frame on the process bus. When processing specific…

    CVSS 7.1 · High
    2 mentions
  • CVE-2026-66360

    The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded present…

    CVSS 8.7 · High
    2 mentions
  • CVE-2026-66349

    The MMS server connection handler contains a flaw in its processing of BER-encoded request data. When an MMS confirmed request PDU containing an extended BER tag is received ove…

    CVSS 6.9 · Medium
    2 mentions
  • CVE-2026-63550

    The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over…

    CVSS 7.1 · High
    2 mentions