5.9

CVE-2024-39702: openresty Inefficient Algorithmic Complexity

CVSS: 5.9v3.1MediumAnalyzed
Published 23-07-2024Last modified 26-11-2024
Open JSON

Vulnerability summary

CVE-2024-39702 is a medium (CVSS 5.9) Inefficient Algorithmic Complexity vulnerability in openresty. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 45.2% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.56%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 23-07-2024
    PublishedVulnerability first disclosed.
  2. 26-11-2024
    Last modifiedVulnerability information updated.

Description

In lj_str_hash.c in OpenResty 1.19.3.1 through 1.25.3.1, the string hashing function (used during string interning) allows HashDoS (Hash Denial of Service) attacks. An attacker could cause excessive resource usage during proxy operations via crafted requests, potentially leading to a denial of service with relatively few incoming requests. This vulnerability only exists in the OpenResty fork in the openresty/luajit2 GitHub repository. The LuaJIT/LuaJIT repository. is unaffected.

CVSS metrics

2 scores · 2 sources · 1 version

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 score
0.56%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Openresty1 product
  • openresty≥ 1.19.3.1, < 1.19.9.2 | ≥ 1.21.4.1, < 1.21.4.4 | 1.25.3.1

1 vendor · 1 product

References

1 links