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CVE-2019-12208

32
FAUCET Score

CVE-2019-12208 is a critical heap-based buffer overflow vulnerability affecting njs through version 0.3.1, a JavaScript engine used in NGINX. This flaw, located in the njs_function_native_call function, allows for remote code execution with high impact on confidentiality, integrity, and availability, as indicated by its CVSS score of 9.8. While there is no evidence of active exploitation, no public exploit code, and it is not listed in CISA's KEV catalog, the vulnerability has garnered significant community discussion. Organizations using affected versions of njs should prioritize patching to mitigate this severe risk.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.3.1CPE matchmatch criteria
cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.71%
Probability of exploitation in next 30 days
EPSS Percentile
74.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0171 is in the 63rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / nginx/njs/issues/163
ExploitThird Party Advisory