9.3

CVE-2011-2883: citrix access_gateway Improper Input Validation

CVSS: 9.3v2.0HighModified
Published 21-07-2011Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2011-2883 is a high (CVSS 9.3) Improper Input Validation vulnerability in citrix access_gateway. EPSS estimates a 1.53% chance of exploitation in the next 30 days, higher than 74.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.3/10
010
High · v2.0 (NVD)
EPSS score
1.53%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-07-2011
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

Description

The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0 before 9.0-70.5, and 9.1 before 9.1-96.4 attempts to validate signed DLLs by checking the certificate subject, not the signature, which allows man-in-the-middle attackers to execute arbitrary code via HTTP header data referencing a DLL that was signed with a crafted certificate.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

1.53%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.53% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.53%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Citrix1 product

1 vendor · 1 product

References

1 links