How severe is CVE-2026-21620?

CVE-2026-21620 has a CVSS 4.0 base score of 2.3, rated low severity.

Is CVE-2026-21620 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21620?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21620 have an EU (EUVD) identifier?

Yes. CVE-2026-21620 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7742.

When was CVE-2026-21620 published?

CVE-2026-21620 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-21620

CVE-2026-21620 is a low-severity vulnerability with a CVSS 4.0 base score of 2.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-23.

Key facts

Severity: Low (CVSS 4.0 base score 2.3)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7742
Weakness: CWE-23
Published: 2026-02-20
Last modified: 2026-06-17

Description

Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal. This vulnerability is associated with program files lib/tftp/src/tftp_file.erl, src/tftp_file.erl. This issue affects otp: from 17.0, from 07b8f441ca711f9812fad9e9115bab3c3aa92f79; otp: from 5.10 before 7.0; otp: from 1.0.

Frequently asked questions

What is CVE-2026-21620?: Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal. This vulnerability is associated with program files lib/tftp/src/tftp_file.erl, src/tftp_file.erl. This issue affects otp: from 17.0, from 07b8f441ca711f9812fad9e9115bab3c3aa92f79; otp: from 5.10 before 7.0; otp: from 1.0.
How severe is CVE-2026-21620?: CVE-2026-21620 has a CVSS 4.0 base score of 2.3, rated low severity.
Is CVE-2026-21620 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21620?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21620 have an EU (EUVD) identifier?: Yes. CVE-2026-21620 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7742.
When was CVE-2026-21620 published?: CVE-2026-21620 was published on 2026-02-20 and last updated on 2026-06-17.

References

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