CVE-2020-13765

Host memory corruption via unchecked ROM addresses

Published Jun 4, 2020 · Updated Aug 4, 2024

Out-of-bounds write in QEMU 4.0 and 4.1.0 allows attackers to corrupt host memory via a crafted kernel image. When rom->addr is less than addr, address subtraction positions d before dest, and memcpy writes image bytes to that invalid destination. Reachability requires control of an image supplied through -kernel; the write crashes QEMU or, in the upstream worst case, injects code into its process.

CVSS severity5.6
Medium
EPSS probability2.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in QEMU 4.0 and 4.1.0 allows attackers to corrupt host memory via a crafted kernel image. When rom->addr is less than addr, address subtraction positions d before dest, and memcpy writes image bytes to that invalid destination. Reachability requires control of an image supplied through -kernel; the write crashes QEMU or, in the upstream worst case, injects code into its process.

The record

CVE
CVE-2020-13765
Published
Jun 4, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 4, 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 vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.6NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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