What is CVE-2021-43099?

CVE-2021-43099 is a medium-severity vulnerability in Diyhi Bbs, classified under Path Traversal. CVSS score: 4.9/10. Published 2022-03-28.

How severe is CVE-2021-43099?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Path Traversal in Diyhi Bbs

CVE-2021-43099

An Archive Extraction (AKA "Zip Slip) vulnerability exists in bbs 5.3 in the UpgradeNow function in UpgradeManageAction.java, which unzips the arbitrary upladed zip file without checking filenames. The vulnerability is exploited using a specially crafted archive that holds directory traversal filenames (e.g. ../../evil.exe).

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.011 (62.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

Affected products

Diyhi Bbs — versions 5.3
N/a — versions n/a

Weakness classification (CWE)

CWE-22 — Path Traversal

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-43099?: CVE-2021-43099 is a medium-severity vulnerability in Diyhi Bbs, classified under Path Traversal. CVSS score: 4.9/10. Published 2022-03-28.
How severe is CVE-2021-43099?: Medium severity. CVSS v3 base score is 4.9 out of 10.