---
title: "CVE-2020-35452: mod_auth_digest possible stack overflow… | CubePath"
description: "Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this…"
language: en
source: https://cubepath.com/security/cve/CVE-2020-35452
---

# CVE-2020-35452: mod_auth_digest possible stack overflow… | CubePath

## Description

Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod\_auth\_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow

Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-35452)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.53191 (53.2% probability)

Percentile

99.0%

Scores of

Nov 10, 2026

Model

v2026.06.15

## Affected products

Products listed in the CVE record, as the CNA published them.

- Apache HTTP Server

  - affected: 2.4.46
  - affected: 2.4.43
  - affected: 2.4.41
  - affected: 2.4.39
  - affected: 2.4.38
  - affected: 2.4.37
  - affected: 2.4.35
  - affected: 2.4.34
  - affected: 2.4.33
  - affected: 2.4.29
  - affected: 2.4.28
  - affected: 2.4.27
  - affected: 2.4.26
  - affected: 2.4.25
  - affected: 2.4.23
  - affected: 2.4.20
  - affected: 2.4.18
  - affected: 2.4.17
  - affected: 2.4.16
  - affected: 2.4.12
  - affected: 2.4.10
  - affected: 2.4.9
  - affected: 2.4.7
  - affected: 2.4.6
  - affected: 2.4.4
  - and 4 more

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [httpd.apache.org/security/vulnerabilities\_24.html](http://httpd.apache.org/security/vulnerabilities%5F24.html)
- [lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdd…](https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E)
- [\[httpd-announce\] 20210609 CVE-2020-35452: mod\_auth\_digest possible stack overflow by one nul byte](https://lists.apache.org/thread.html/rccb1b8225583a48c6360edc7a93cc97ae8b0215791e455dc607e7602%40%3Cannounce.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [\[httpd-dev\] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.json](https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [\[oss-security\] 20210609 CVE-2020-35452: Apache httpd: mod\_auth\_digest possible stack overflow by one nul byte](http://www.openwall.com/lists/oss-security/2021/06/10/5)  (openwall.com) mailing-list
- [\[debian-lts-announce\] 20210709 \[SECURITY\] \[DLA 2706-1\] apache2 security update](https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html)  (lists.debian.org) mailing-list
- [DSA-4937](https://www.debian.org/security/2021/dsa-4937)  (debian.org) vendor-advisory
- [GLSA-202107-38](https://security.gentoo.org/glsa/202107-38)  (security.gentoo.org) vendor-advisory
- [FEDORA-2021-dce7e7738e](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/)  (lists.fedoraproject.org) vendor-advisory
- [FEDORA-2021-e3f6dd670d](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/)  (lists.fedoraproject.org) vendor-advisory
- [oracle.com/security-alerts/cpuoct2021.html](https://www.oracle.com/security-alerts/cpuoct2021.html)
- [security.netapp.com/advisory/ntap-20210702-0001](https://security.netapp.com/advisory/ntap-20210702-0001/)

## Timeline

1. ID reserved Dec 14, 2020
2. Record published Jun 10, 2021
3. Record last updated Aug 4, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)