No exploitation reported

CVE-2020-35452

No exploitation reported by the sources we read.

Published2021-06-10
WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

Timeline

dates in UTC

2021-06-1007:15CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-35452?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-35452?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Oracle instantis enterprisetrack

Branch	Affected	Fixed in	Source
17.1	= 17.1	no fix published	NVD
17.2	= 17.2	no fix published	NVD
17.3	= 17.3	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
34.x	= 34	no fix published	NVD
35.x	= 35	no fix published	NVD

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

httpdAlmaLinux:8all versions · fixed in 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.almaand 6 other packages
httpdAlmaLinux:8all versions · fixed in 2.4.37-47.module_el8.6.0+2935+fb177b09.2and 6 other packages
mod_http2AlmaLinux:8all versions · fixed in 1.15.7-5.module_el8.6.0+2872+fe0ff7aa
mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.almaand 1 other package
mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-47.module_el8.6.0+2935+fb177b09.2and 1 other package

Full record on NVD

Fix

Advisories and patches

httpd.apache.orgVendor Advisory
lists.apache.orgRelease Notes · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.3read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score54.8 %read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: 2021-06-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-35452?

Is CVE-2020-35452 actively exploited?

Active exploitation of CVE-2020-35452 has not been confirmed. Its EPSS score was 54.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-35452?

CVE-2020-35452 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

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