5.3

CVE-2023-30851: Potential HTTP policy bypass when using header rules in Cilium

Modified
AliasesCGA-9m3v-699c-wf7mCGA-grq2-3v8m-2h24GHSA-2h44-x2wx-49f4
Published 25-05-2023Last modified 16-01-2025

Vulnerability summary

CVE-2023-30851 is a medium (CVSS 5.3) Protection Mechanism Failure vulnerability in cilium. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.7% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.66%
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 0 · Related 6
CGA-CX67-GP7M-4Q36CGA-GPJH-JQC7-W53HCGA-J5XM-929F-73RQCGA-VGR6-XRVR-W6QFCGA-WQG9-JVC2-QQV7CGA-XRQG-267F-7382

Timeline

  1. 25-05-2023
    PublishedVulnerability first disclosed.
  2. 16-01-2025
    Last modifiedVulnerability information updated.

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. This issue only impacts users who have a HTTP policy that applies to multiple `toEndpoints` AND have an allow-all rule in place that affects only one of those endpoints. In such cases, a wildcard rule will be appended to the set of HTTP rules, which could cause bypass of HTTP policies. This issue has been patched in Cilium 1.11.16, 1.12.9, and 1.13.2.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.66% on 22-09-2026

22-09-202622-10-2026

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

Chainguard18 products
  • cilium-1.15All versions (No fix recorded)
  • cilium-1.15-clustermesh-apiserverAll versions (No fix recorded)
  • cilium-1.15-container-initAll versions (No fix recorded)
  • cilium-1.15-container-init-compatAll versions (No fix recorded)
  • cilium-1.15-hubble-relayAll versions (No fix recorded)
Cilium1 product
  • cilium< 1.11.16 | ≥ 1.12.0, < 1.12.9 | ≥ 1.13.0, < 1.13.2
Github.com/cilium1 product
  • cilium< 1.11.16 | ≥ 1.12.0, < 1.12.9 | ≥ 1.13.0, < 1.13.2
Wolfi1 product
  • hubble-ui-backend< 0.12.0-r0

4 vendors · 21 products

References

7 links