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CVE-1999-1203

15
FAUCET Score

CVE-1999-1203 describes a denial-of-service vulnerability in Ascend's Multilink PPP for ISDN, affecting versions prior to 4.6. Remote attackers could exploit this by sending a spoofed endpoint identifier. With a CVSS score of 5.0 (Medium), this vulnerability is easily exploitable over the network with low complexity and requires no authentication, leading to a denial of service. Despite its age, there is no evidence of active exploitation, no public exploit code available (Metasploit, Nuclei, ExploitDB), and it has garnered no community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.6CPE matchmatch criteria
cpe:2.3:o:ascend:multilink_ppp_for_isdn:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.61%
Probability of exploitation in next 30 days
EPSS Percentile
73.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0161 is in the 58th percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

marc.info
marc.info
iss.net / security_center/static/7498.php