Vulnerability in StackGuard before 1.21 allows remote attackers to bypass the Random and Terminator Canary security mechanisms by using a non-linear attack which directly modifies a pointer to a return address instead of using a buffer overflow to reach the return address entry itself.
Conclusion & alert: CVE-1999-1111 is rated Moderate Risk (57.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.82%). Core evidence: EPSS rose +1.10% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.72% | 1.82% | +1.10% |
| 2 | 2025-03-17 | 0.84% | 0.72% | -0.12% |
| 3 | 2023-03-07 | — | 0.84% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| immunix | stackguard | <= 1.21 | cpe:2.3:a:immunix:stackguard:*:*:*:*:*:*:*:* |