CVE-2020-11729Public exploitNetwork attack vector

User impersonation via forgeable long-term session cookies

Published Apr 15, 2020 · Updated Aug 4, 2024

Session authentication weakness in DAViCal Andrew's Web Libraries through 0.60 allows remote attackers to impersonate users via LSID cookies. LSIDLogin validates a salted MD5 derived from a predictable user number, username, and often known LDAP password data while accepting an attacker-chosen salt. LDAP deployments with empty or fixed stored passwords expose the clearest path; a forged cookie grants the victim's application session indefinitely.

CVSS severity9.8
Critical
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session authentication weakness in DAViCal Andrew's Web Libraries through 0.60 allows remote attackers to impersonate users via LSID cookies. LSIDLogin validates a salted MD5 derived from a predictable user number, username, and often known LDAP password data while accepting an attacker-chosen salt. LDAP deployments with empty or fixed stored passwords expose the clearest path; a forged cookie grants the victim's application session indefinitely.

The record

CVE
CVE-2020-11729
Published
Apr 15, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-384, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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-384Session Fixation
T1078Valid Accounts

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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