What is CVE-2023-37978?

CVE-2023-37978 is a medium-severity vulnerability in Dimitar Ivanov HTTP Headers, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.4/10. Published 2023-11-13.

How severe is CVE-2023-37978?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Is CVE-2023-37978 known to be exploited?

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

SSRF in Dimitar Ivanov HTTP Headers

CVE-2023-37978

Server-Side Request Forgery (SSRF) vulnerability in Dimitar Ivanov HTTP Headers.This issue affects HTTP Headers: from n/a through 1.18.11.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-11-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.8th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

20142995/nuclei-templates

References

patchstack.com/database/vulnerability/http-headers/wordpress-http-headers-plugi… (Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2023-37978?: CVE-2023-37978 is a medium-severity vulnerability in Dimitar Ivanov HTTP Headers, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.4/10. Published 2023-11-13.
How severe is CVE-2023-37978?: Medium severity. CVSS v3 base score is 4.4 out of 10.
Is CVE-2023-37978 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.