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CVE-2017-6742

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to…

Description

A vulnerability in the SNMP implementation of could allow an authenticated, remote attacker to cause a reload of the affected system or to remotely execute code. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the affected device.  The vulnerability is due to a buffer overflow in the affected code area. The vulnerability affects all versions of SNMP (versions 1, 2c, and 3). The attacker must know the SNMP read only community string (SNMP version 2c or earlier) or the user credentials (SNMPv3). An exploit could allow the attacker to execute arbitrary code and obtain full control of the system or to cause a reload of the affected system. Only traffic directed to the affected system can be used to exploit this vulnerability.

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability.

Added
19 Apr 2023
Fix due (US federal)
10 May 2023
Used by ransomware
Not known

Apply updates per vendor instructions.

ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 19 Apr 2023.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.

Timeline

  1. ID reserved

    By cisco

  2. · 4 months later

    Published

  3. · 6 years later

    Added to CISA KEV

    Known exploited in the wild

  4. · 3 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2017-6742, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.0High8.8CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
21.3% · top 2.4% of all CVEs (9 Nov 2026)
CISA SSVC
Exploitation: active · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Affected products

  • Cisco · Cisco IOS XE Software

    • affected 3.7.0S
    • affected 3.7.1S
    • affected 3.7.2S
    • affected 3.7.3S
    • affected 3.7.4S
    • affected 3.7.5S
    • affected 3.7.6S
    • affected 3.7.7S
    • affected 3.7.4aS
    • affected 3.7.2tS
    • affected 3.7.0bS
    • affected 3.8.0S
    • affected 3.8.1S
    • affected 3.8.2S
    • affected 3.9.1S
    • affected 3.9.0S
    • affected 3.9.2S
    • affected 3.9.0aS
    • affected 3.11.1S
    • affected 3.11.2S
    • affected 3.11.0S
    • affected 3.11.3S
    • affected 3.11.4S
    • affected 3.12.0S
    • affected 3.12.1S
    • affected 3.12.2S
    • affected 3.12.3S
    • affected 3.12.0aS
    • affected 3.12.4S
    • affected 3.13.0S
    • affected 3.13.1S
    • affected 3.13.2S
    • affected 3.13.3S
    • affected 3.13.4S
    • affected 3.13.5S
    • affected 3.13.2aS
    • affected 3.13.0aS
    • affected 3.13.5aS
    • affected 3.13.6S
    • affected 3.13.7S
    • and 52 more

  • IntelliShield · Universal Product

    • affected N/A

What to do

Exploitation: At the time of initial publication, Cisco was aware of external knowledge of the vulnerabilities described in this advisory and, as a precaution, notified customers about the potential for exploitation. On January 6, 2017, a security researcher published functional exploit code for these vulnerabilities. The Cisco Product Security Incident Response Team (PSIRT) is aware of exploitation of the following vulnerabilities that are described in this advisory: CVE-2017-6736 CVE-2017-6737 CVE-2017-6738 CVE-2017-6739 CVE-2017-6740 CVE-2017-6742 CVE-2017-6743 CVE-2017-6744 The Cisco PSIRT is aware of exploit code available for CVE-2017-6741. Additional information can be found at Cisco TALOS: DNS Hijacking Abuses Trust In Core Internet Service ["https://blog.talosintelligence.com/2019/04/seaturtle.html"].

References

5

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .