What is CVE-2022-31778?

CVE-2022-31778 is a high-severity vulnerability in Apache Traffic Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-08-10.

How severe is CVE-2022-31778?

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

Improper input validation in Apache Traffic Server

CVE-2022-31778

Improper Input Validation vulnerability in handling the Transfer-Encoding header of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 8.0.0 to 9.0.2.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-08-10 · 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:H/A:N.

EPSS exploit prediction

EPSS: 0.021 (80.9th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.021 · change: +0.000

Affected products

Apache Traffic Server
Apache Software Foundation Traffic Server — versions 8.0.0 to 9.0.2
Debian Linux — versions 11.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

lists.apache.org/thread/rc64lwbdgrkv674koc3zl1sljr9vwg21 (Mailing List, Vendor Advisory)
www.debian.org/security/2022/dsa-5206 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/04/msg00007.html (mailing-list)

Frequently asked questions

What is CVE-2022-31778?: CVE-2022-31778 is a high-severity vulnerability in Apache Traffic Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-08-10.
How severe is CVE-2022-31778?: High severity. CVSS v3 base score is 7.5 out of 10.