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CVE-2021-41054: tftpd_file.c in atftp through 0.7.4 has a buffer overflow because buffer-size handling does not properly co...

tftpd_file.c in atftp through 0.7.4 has a buffer overflow because buffer-size handling does not properly consider the combination of data, OACK, and other options.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-41054 is a buffer overflow in atftp through 0.7.4. The issue involves unsafe buffer-size handling when TFTP data and options are combined. Business risk depends on whether atftp or atftpd is installed and reachable, especially on networks using TFTP for provisioning or embedded-device workflows.

Executive priority

Prioritize if TFTP is used in provisioning, firmware, PXE, or embedded-device environments. If atftp is not installed or not reachable, urgency is lower. Because severity data is missing, validate exposure before emergency action.

Technical view

The CVE identifies tftpd_file.c in atftp through 0.7.4 as vulnerable because buffer sizing mishandles combinations of data, OACK, and other options. Debian published an LTS security update, and an upstream SourceForge changeset is referenced. The source bundle does not include CVSS, CWE, or detailed exploitability analysis.

Likely exposure

Exposure is most likely where atftp or atftpd through 0.7.4 is installed, particularly Debian LTS systems or provisioning networks using TFTP. Public internet exposure would increase concern, but the sources do not provide prevalence or confirmed exposed-product details.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. A public GitHub reference exists, but the provided evidence is insufficient to claim real-world exploitation. Treat exploit status as unconfirmed.

Researcher notes

Key unknowns are impact scope, CVSS severity, and reliable exploit status. Focus validation on atftp version, service reachability, and whether the Debian or upstream fix is present. Avoid assuming broader TFTP product impact from this CVE alone.

Mitigation direction

  • Inventory systems for atftp and atftpd installations.
  • Apply Debian DLA 2820-1 or equivalent vendor security updates.
  • Check upstream atftp guidance and referenced SourceForge fix details.
  • Restrict TFTP access to required trusted networks only.
  • Disable atftpd where TFTP service is not business-required.

Validation and detection

  • Confirm installed atftp versions are not vulnerable.
  • Verify patched packages or fixed source revisions are deployed.
  • Check whether UDP TFTP service is listening or reachable.
  • Review firewall rules limiting TFTP to approved hosts.
  • Document business owners for any remaining TFTP services.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-41054 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.