What is CVE-2020-13432?

CVE-2020-13432 is a high-severity vulnerability in Rejetto HTTP File Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2020-06-08.

How severe is CVE-2020-13432?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2020-13432 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Rejetto HTTP File Server

CVE-2020-13432

rejetto HFS (aka HTTP File Server) v2.3m Build #300, when virtual files or folders are used, allows remote attackers to trigger an invalid-pointer write access violation via concurrent HTTP requests with a long URI or long HTTP headers.

Vulnerability class: Buffer Overflow

Published 2020-06-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.309 (98.2th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.309 · newest: 0.309 · change: 0.000

Affected products

Rejetto HTTP File Server — versions 2.3m

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

www.rejetto.com/hfs/ (Release Notes, Vendor Advisory)
github.com/rejetto/hfs2/commit/b8ebfc4e22948e1a61506cd66e397b61ea5ea5de (Patch, Third Party Advisory)
packetstormsecurity.com/files/157980/HFS-Http-File-Server-2.3m-Build-300-Buffer… (Exploit, VDB Entry, Third Party Advisory)
hyp3rlinx.altervista.org/advisories/HFS-HTTP-FILE-SERVER-v2.3-REMOTE-BUFFER-OVE… (Exploit, Third Party Advisory)
packetstormsecurity.com/files/157980/HFS-Http-File-Server-2.3m-Build-300-Buffer… (Exploit, VDB Entry, Third Party Advisory)
seclists.org/fulldisclosure/2020/Jun/13 (mailing-list, Exploit, Mailing List, Third Party Advisory)
seclists.org/fulldisclosure/2021/Apr/12 (mailing-list)

Frequently asked questions

What is CVE-2020-13432?: CVE-2020-13432 is a high-severity vulnerability in Rejetto HTTP File Server, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2020-06-08.
How severe is CVE-2020-13432?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-13432 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.