Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation
- Exploited
- Proof of concept public, per CISA
- Fix
- No fix listed
- Who is exposed
- Not reported
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 40/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: poc
- Automatable: no
- Technical impact: partial
Summary
MIT Kerberos 5 (krb5) is affected through its kadmind administration service, where the GSS-RPC layer fails to limit the size of XDR-decoded data. An attacker who can reach the service over the network and has a valid login (low privilege) can send crafted RPC requests that trigger unbounded memory allocations, exhausting memory or CPU and denying service to kadmind.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
The GSS-RPC layer in MIT Kerberos 5 (aka krb5) does not enforce size limits on XDR-decoded data, which allows remote authenticated users to cause a denial of service (memory exhaustion or excessive CPU consumption in kadmind) via crafted RPC requests that trigger unbounded memory allocations during XDR decoding.
cve.now Index
- Exploitation15/40CISA rates a proof of concept as public
- Exposure3/25Reachable over the network · Unknown: No advisory context yet
- Reach10/20Shipped in major Linux distributions
- Severity6.5/10CVSS 6.5
- No patch5/5No patch listed yet
What would change the score
- Would score about 80 if added to CISA KEV
- Would score about 75 if CISA's SSVC rates exploitation active
- Would score about 59 if advisories confirm default setups are exposed
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: poc · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
- krb5
Version range not reported
Evidence 2
- Report
- Link
Corrections
None so far.
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