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CVE-2010-4020

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which...

6.3 MediumFix available

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

1.92%Down 0.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 6.3

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
CVE-2010-4020
CVSS 3.0
6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-310
Updated
2026-11-02
CVE List No score

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
CVE-2010-4020
Updated
2026-11-02
EUVDEUVD-2010-3996 No score

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
EUVD-2010-3996
Updated
2026-11-03
GitHub AdvisoriesGHSA-27hw-qqm8-6prm 6.3

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which...

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
GHSA-27hw-qqm8-6prm
CVSS 3.0
6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSV 6.3

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
CVE-2010-4020
CVSS 3.0
6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2010-4020 6.3

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Record
DEBIAN-CVE-2010-4020
CVSS 3.0
6.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVopenSUSE-SU-2024:10004-1 No score

krb5-1.15-1.1 on GA media

These are all security issues fixed in the krb5-1.15-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10004-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
krb5
Debian:12
 before 1.8.3+dfsg-3
1.8.3+dfsg-3
krb5
Debian:13
 before 1.8.3+dfsg-3
1.8.3+dfsg-3
krb5
Debian:14
 before 1.8.3+dfsg-3
1.8.3+dfsg-3
krb5
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-debuginfo
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-devel
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server-ldap
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-libs
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-pkinit-openssl
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
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Affected packages
PackageAffectedFixed
krb5-workstation
Red Hat:enterprise_linux:6::client
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-debuginfo
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-devel
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-pkinit-openssl
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server-ldap
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-workstation
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-libs
Red Hat:enterprise_linux:6::computenode
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-debuginfo
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-devel
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-libs
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-pkinit-openssl
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server-ldap
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-workstation
Red Hat:enterprise_linux:6::server
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-debuginfo
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-devel
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-libs
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-pkinit-openssl
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-server-ldap
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5-workstation
Red Hat:enterprise_linux:6::workstation
From an advisory covering 3 CVEs
 before 0:1.8.2-3.el6_0.3
0:1.8.2-3.el6_0.3
krb5
openSUSE:Tumbleweed
From an advisory covering 54 CVEs
 before 1.15-1.1
1.15-1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2010-4020 is a medium vulnerability (CVSS 6.3) in Mit Kerberos 5, published December 2, 2010. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.92%, the 80th percentile. Fixed in krb5 1.8.3+dfsg-3.

References

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