CVE-2023-27729
CVE-2023-27729 is a high-severity vulnerability in F5 Njs with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (51st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: F5 Njs
- Published:
- Last modified:
Description
Nginx NJS v0.7.10 was discovered to contain an illegal memcpy via the function njs_vmcode_return at src/njs_vmcode.c.
Frequently asked questions
- What is CVE-2023-27729?
- Nginx NJS v0.7.10 was discovered to contain an illegal memcpy via the function njs_vmcode_return at src/njs_vmcode.c.
- How severe is CVE-2023-27729?
- CVE-2023-27729 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2023-27729 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2023-27729?
- CVE-2023-27729 affects F5 Njs. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2023-27729?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2023-27729 published?
- CVE-2023-27729 was published on 2023-04-09 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:f5:njs:0.7.10:*:*:*:*:*:*:*
More vulnerabilities in F5 Njs
- CVE-2020-19695 — Critical (CVSS 9.8): Buffer Overflow found in Nginx NJS allows a remote attacker to execute arbitrary code via the njs_object_property…
- CVE-2020-19692 — Critical (CVSS 9.8): Buffer Overflow vulnerabilty found in Nginx NJS v.0feca92 allows a remote attacker to execute arbitrary code via the…
- CVE-2022-43286 — Critical (CVSS 9.8): Nginx NJS v0.7.2 was discovered to contain a heap-use-after-free bug caused by illegal memory copy in the function…
- CVE-2022-29379 — Critical (CVSS 9.8): Nginx NJS v0.7.3 was discovered to contain a stack overflow in the function njs_default_module_loader at…
- CVE-2022-27007 — Critical (CVSS 9.8): nginx njs 0.7.2 is affected suffers from Use-after-free in njs_function_frame_alloc() when it try to invoke from a…
- CVE-2022-25139 — Critical (CVSS 9.8): njs through 0.7.0, used in NGINX, was discovered to contain a heap use-after-free in njs_await_fulfilled.
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