CVE-2020-13249Network attack vector

Client crash via unchecked OK packet lengths

Published May 20, 2020 · Updated Aug 4, 2024

Memory corruption in MariaDB Connector/C before 3.1.8 allows remote attackers to crash a client via a crafted server OK packet. The ma_read_ok_packet parser trusts length-encoded fields beyond the remaining packet and copies an unchecked value into the fixed-size cs_name buffer. A target must connect to a malicious or compromised MariaDB or MySQL server; public analysis demonstrates client crashes but not code execution.

CVSS severity8.8
High
EPSS probability2.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in MariaDB Connector/C before 3.1.8 allows remote attackers to crash a client via a crafted server OK packet. The ma_read_ok_packet parser trusts length-encoded fields beyond the remaining packet and copies an unchecked value into the fixed-size cs_name buffer. A target must connect to a malicious or compromised MariaDB or MySQL server; public analysis demonstrates client crashes but not code execution.

The record

CVE
CVE-2020-13249
Published
May 20, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2020CVE 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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 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

T1499.004Application or System Exploitation

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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