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CVE-1999-1306

21
FAUCET Score

CVE-1999-1306 describes a vulnerability in Cisco IOS 9.1 and earlier where improper handling of extended IP access lists with the "established" keyword and enabled IP route cache allows attackers to bypass security filters. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity, potentially leading to partial compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, suggesting it is not currently a prevalent threat.

Impacted Technologies

VendorProductVersion(s)CPE
<= 9.1CPE matchmatch criteria
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0139 is in the 50th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cert.org / advisories/CA-1992-20.html
PatchThird Party AdvisoryUS Government Resource