CVE-2012-1316Public exploitNetwork attack vector

HTTPS spoofing via omitted certificate revocation checks

Published Jan 15, 2020 · Updated Nov 15, 2024

Improper certificate validation in Cisco IronPort Web Security Appliance through at least 2012-04-11 allows attackers to spoof HTTPS sites. Its server-side TLS validation omits both CRL and OCSP revocation checks, then issues a trusted client-side certificate for a revoked upstream certificate. Exploitation requires a man-in-the-middle position outside the proxy and a compromised certificate that has been revoked; internal clients then trust the spoofed endpoint.

CVSS severity5.9
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Cisco IronPort Web Security Appliance through at least 2012-04-11 allows attackers to spoof HTTPS sites. Its server-side TLS validation omits both CRL and OCSP revocation checks, then issues a trusted client-side certificate for a revoked upstream certificate. Exploitation requires a man-in-the-middle position outside the proxy and a compromised certificate that has been revoked; internal clients then trust the spoofed endpoint.

The record

CVE
CVE-2012-1316
Published
Jan 15, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Secure Web Appliance
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=through at least 2012-04-11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Secure Web Applianceversion=through at least 2012-04-11

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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