5.9

CVE-2023-47124: Denial of service whith ACME HTTPChallenge in Traefik

Modified
AliasesGHSA-8g85-whqh-cr2fGO-2023-2381
Published 04-12-2023Last modified 18-12-2024
Some data may be incomplete
  • 1 reference with an unsupported link type was hidden.

Vulnerability summary

CVE-2023-47124 is a medium (CVSS 5.9) vulnerability in traefik. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 56.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.79%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 5
OPENSUSE-SU-2024:13506-1OPENSUSE-SU-2024:14076-1CGA-96JX-28RP-CV2FCGA-W5F8-74CV-XHP5CGA-WXX9-7C6R-JP6P

Timeline

  1. 04-12-2023
    PublishedVulnerability first disclosed.
  2. 18-12-2024
    Last modifiedVulnerability information updated.

Description

Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.79%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.79% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/traefik/traefik2 products
  • v2< 2.10.6
  • v3< 3.0.0-beta5
Github.com/traefik1 product
  • traefikAll versions (No fix recorded)
Traefik1 product
  • traefikEOL< 2.10.6 | ≥ 3.0.0-beta1, < 3.0.0-beta5 | ≤ 2.10.5 | 3.0.0:beta1 | 3.0.0:beta2 | 3.0.0:beta3 | 3.0.0:beta4

3 vendors · 4 products

References

9 links