CVE-2023-27727: f5 njs Out-of-bounds Read
CVSS: 7.5v3.1HighModified
Published 09-04-2023Last modified 12-02-2025
Vulnerability summary
CVE-2023-27727 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in f5 njs. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.4% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.73%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 09-04-2023PublishedVulnerability first disclosed.
- 12-02-2025Last modifiedVulnerability information updated.
Description
Nginx NJS v0.7.10 was discovered to contain a segmentation violation via the function njs_function_frame at src/njs_function.h.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.73%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
0.00 pp
From 0.73% on 18-09-2026
18-09-202618-10-2026
EPSS score0.73%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundNjs
Maturity: poc
Weaknesses
CWE · root causeAffected systems
F51 product
- njs0.7.10
1 vendor · 1 product