CVE-2020-7211Network attack vector

Host file disclosure via backslash path traversal

Published Jan 21, 2020 · Updated Aug 4, 2024

Path traversal in libslirp 4.1.0 and QEMU 4.2.0 allows remote attackers with TFTP access to read files outside the TFTP root on Windows. The tftp.c path validation fails to recognize backslashes as Windows path separators when checking a requested file for parent-directory components. Exploitation requires an enabled, reachable SLiRP TFTP server on a Windows host and exposes files accessible to the host process.

CVSS severity7.5
High
EPSS probability4.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in libslirp 4.1.0 and QEMU 4.2.0 allows remote attackers with TFTP access to read files outside the TFTP root on Windows. The tftp.c path validation fails to recognize backslashes as Windows path separators when checking a requested file for parent-directory components. Exploitation requires an enabled, reachable SLiRP TFTP server on a Windows host and exposes files accessible to the host process.

The record

CVE
CVE-2020-7211
Published
Jan 21, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 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

5.1SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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