7.5

CVE-2017-17439: debian debian_linux NULL Pointer Dereference

CVSS: 7.5v3.0HighModified
AliasesALPINE-CVE-2017-17439MGASA-2017-0485UBUNTU-CVE-2017-17439
Published 06-12-2017Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-17439 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 3.43% chance of exploitation in the next 30 days, higher than 88.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
3.43%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-12-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

3.43%

Chance of exploitation in the next 30 days

Percentile

89%

Versus all other CVEs

30-day change

0.00 pp

From 3.43% on 19-09-2026

19-09-202619-10-2026
EPSS score
3.43%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • heimdal< 7.5.0+dfsg-1 | < 7.1.0+dfsg-13+deb9u2
  • debian_linuxEOL9.0
Alpine1 product
  • heimdal< 7.4.0-r2 | < 7.1.0-r2
Heimdal_project1 product
Mageia1 product
  • heimdal< 7.3.0-1.2.mga6
Ubuntu1 product
  • heimdal< 7.5.0+dfsg-1

5 vendors · 6 products

References

13 links
Show all 13 references