CVE-2026-33006: apache software foundation apache http server Observable Timing Discrepancy
CVSS: 4.8v3.1MediumAnalyzed
AliasesALPINE-CVE-2026-33006UBUNTU-CVE-2026-33006DEBIAN-CVE-2026-33006
Published 04-05-2026Last modified 04-05-2026
Vulnerability summary
CVE-2026-33006 is a medium (CVSS 4.8) Observable Timing Discrepancy vulnerability in apache software foundation apache http server. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.3% of scored vulnerabilities.
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)EPSS score
0.56%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 12 · Related 8Timeline
- 04-05-2026PublishedVulnerability first disclosed.
- 04-05-2026Last modifiedVulnerability information updated.
Description
A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a remote attacker. Users are recommended to upgrade to version 2.4.67, which fixes this issue.
CVSS metrics
5 scores · 5 sources · 1 versionMedium 4.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- OSV · UbuntuEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- NVDNIST4.8MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS trend
Probability
0.56%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
0.00 pp
From 0.56% on 19-09-2026
19-09-202619-10-2026
EPSS score0.56%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- apache2< 2.4.67-r0
Apache1 product
- http_server< 2.4.67
Apache software foundation1 product
- apache http server≤ 2.4.66
Debian1 product
- apache2< 2.4.67-1~deb12u2 | < 2.4.67-1~deb13u2 | < 2.4.67-1
Ubuntu1 product
- apache2< 2.4.7-1ubuntu4.22+esm15 | < 2.4.18-2ubuntu3.17+esm20 | < 2.4.29-1ubuntu4.27+esm11 | < 2.4.41-4ubuntu3.23+esm6 | < 2.4.52-1ubuntu4.20 | < 2.4.58-1ubuntu8.12 | < 2.4.64-1ubuntu3.4 | < 2.4.66-2ubuntu2.1
5 vendors · 5 products
References
9 links- httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
