schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly validate UDP packets before sending r
schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly validate UDP packets before sending responses, which allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by krb_pingpong.nasl, a related issue to CVE-1999-0103.
- Published
- May 29, 2013
- Updated
- Jun 16, 2026
- EPSS
- 6.4% · 93th percentile
- CWE
- CWE-20
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 6.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mit | kerberos 5 | cpe:2.3:a:mit:kerberos_5 |
| opensuse | opensuse | cpe:2.3:o:opensuse:opensuse |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux12.04
- canonical ubuntu linux14.04
- canonical ubuntu linux15.04
- canonical ubuntu linux15.10
- debian debian linux6.0
- debian debian linux7.0
- debian debian linux8.0
- fedoraproject fedora17
- fedoraproject fedora18
- fedoraproject fedora19
- mit kerberos 5before 1.11.3
- opensuse opensuse11.4
- opensuse opensuse12.2
- opensuse opensuse12.3
- redhat enterprise linux desktop5.0
- redhat enterprise linux desktop6.0
- redhat enterprise linux eus5.9
- redhat enterprise linux eus6.4
- redhat enterprise linux server5.0
- redhat enterprise linux server6.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | krb5 | before 1.10.1+dfsg-6 | 1.10.1+dfsg-6 |
| Debian:6.0 | krb5 | before 1.8.3+dfsg-4squeeze7 | 1.8.3+dfsg-4squeeze7 |
| Debian:7 | krb5 | before 1.10.1+dfsg-5+deb7u1 | 1.10.1+dfsg-5+deb7u1 |
| openSUSE:Tumbleweed | krb5 | before 1.15-1.1 | 1.15-1.1 |
| Red Hat:enterprise_linux:5::server | krb5 | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-debuginfo | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-devel | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-libs | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-server | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-server-ldap | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:5::server | krb5-workstation | before 0:1.6.1-70.el5_9.2 | 0:1.6.1-70.el5_9.2 |
| Red Hat:enterprise_linux:6::client | krb5 | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-debuginfo | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-devel | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-libs | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-pkinit-openssl | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-server | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-server-ldap | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
| Red Hat:enterprise_linux:6::client | krb5-workstation | before 0:1.10.3-10.el6_4.3 | 0:1.10.3-10.el6_4.3 |
Same product
mit: all recordsOther highest-scoring records for the same primary product.
- CVE-2007-0956The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass authentication and gain system access via a username 49Plan
- CVE-2011-0285The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT Kerberos 5 (aka krb5) 1.7 through 1.9 46Plan
- CVE-2001-0247Buffer overflows in BSD-based FTP servers allows remote attackers to execute arbitrary commands via a long pattern string containing a {} se46Plan
- CVE-2002-1235The kadm_ser_in function in (1) the Kerberos v4compatibility administration daemon (kadmind4) in the MIT Kerberos 5 (krb5) krb5-1.2.6 and ea45Plan
- CVE-2009-0846The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) befor43Plan
- CVE-2008-0947Buffer overflow in the RPC library used by libgssrpc and kadmind in MIT Kerberos 5 (krb5) 1.4 through 1.6.3 allows remote attackers to execu43Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:krb5 | 1.10.1+dfsg-6 · Debian:12 | Package registry (OSV) |
| opensuse:krb5 | 1.15-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:krb5 | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-debuginfo | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-devel | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-libs | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-pkinit-openssl | 0:1.10.3-10.el6_4.3 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:krb5-server | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-server-ldap | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
| red hat:krb5-workstation | 0:1.6.1-70.el5_9.2 · Red Hat:enterprise_linux:5::server | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- krbdev.mit.edu/rt/Ticket/Display.html?id=7637
- lists.fedoraproject.org/pipermail/package-announce/2013-May/105879.html
- lists.fedoraproject.org/pipermail/package-announce/2013-May/105978.html
- lists.fedoraproject.org/pipermail/package-announce/2013-May/106698.html
- lists.opensuse.org/opensuse-updates/2013-07/msg00004.html
- lists.opensuse.org/opensuse-updates/2013-07/msg00007.html
- rhn.redhat.com/errata/RHSA-2013-0942.html
- www.debian.org/security/2013/dsa-2701
- www.mandriva.com/security/advisories?name=MDVSA-2013:166
- www.ubuntu.com/usn/USN-2810-1
- bugzilla.redhat.com/show_bug.cgi?id=962531
- github.com/krb5/krb5/commit/cf1a0c411b2668c57c41e9c4efd15ba17b6b322c
Vendor advisories and official records. Exploit/PoC links are deliberately left out.