Is CVE-2026-21620 in the CISA KEV catalog?

No. CVE-2026-21620 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the EPSS score for CVE-2026-21620?

CVE-2026-21620 has an EPSS score of 0.46% (37th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21620?

Upgrade erlang on debian 11 to 1:23.2.6+dfsg-1+deb11u4 or later.

CVE & CISA-KEV Catalog

CVE-2026-21620

UNSCORED

NVD

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.

CWE-23

How to fix

Remediation Available

erlangDebian

Fixed in:1:23.2.6+dfsg-1+deb11u4CVE-2026-21620

Fixed in:1:25.2.3+dfsg-1+deb12u4CVE-2026-21620

Fixed in:1:27.3.4.1+dfsg-1+deb13u2CVE-2026-21620

Fixed in:1:27.3.4.8+dfsg-1CVE-2026-21620

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.46%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

Other references8

Related Vulnerabilities

Other CWE-23 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-27199	High	7.3	100%	KEV + Ransom	Fix
CVE-2020-5410	High	7.5	96%	KEV	Fix
CVE-2021-40870	Critical	9.8	92%	KEV	Fix
CVE-2025-64446	Critical	9.8	89%	KEV	Fix
CVE-2020-5405	Medium	6.5	69%	-	Fix
CVE-2025-55752	High	7.5	67%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-06.