CVE-2017-9103Network attack vector

Crash and memory disclosure via unchecked label parsing

Published Jun 18, 2020 · Updated Aug 5, 2024

Memory corruption in GNU adns before 1.5.2 allows remote attackers to crash calling applications or expose process memory via DNS responses. The pap_mailbox822 parser fails to check the status returned by adns__findlabel_next before using an uninitialized stack value as the first label length. Exposure is limited to applications issuing non-raw SOA or RP queries, with outcomes including excessive allocation, a crash, memory disclosure, or a buffer overrun.

CVSS severity9.8
Critical
EPSS probability2.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in GNU adns before 1.5.2 allows remote attackers to crash calling applications or expose process memory via DNS responses. The pap_mailbox822 parser fails to check the status returned by adns__findlabel_next before using an uninitialized stack value as the first label length. Exposure is limited to applications issuing non-raw SOA or RP queries, with outcomes including excessive allocation, a crash, memory disclosure, or a buffer overrun.

The record

CVE
CVE-2017-9103
Published
Jun 18, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 18, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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