CVE-2020-7982Public exploitNetwork attack vector

MITM root code execution via skipped package checksums

Published Mar 16, 2020 · Updated Aug 4, 2024

Checksum bypass in OpenWrt 18.06.0 through 18.06.6 and 19.07.0 and LEDE 17.01.0 through 17.01.7 allows man-in-the-middle attackers to run code. In opkg's package-list parser, a whitespace-skipping branch fails to advance the checksum string pointer, so hexadecimal decoding returns a zero-length SHA-256 value and downloaded .ipk files bypass integrity verification. Exploitation requires an attacker to serve a valid signed index and a forged package of the indexed size while opkg install runs; because opkg runs as root, the payload executes with root privileges.

CVSS severity8.1
High
EPSS probability1.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Checksum bypass in OpenWrt 18.06.0 through 18.06.6 and 19.07.0 and LEDE 17.01.0 through 17.01.7 allows man-in-the-middle attackers to run code. In opkg's package-list parser, a whitespace-skipping branch fails to advance the checksum string pointer, so hexadecimal decoding returns a zero-length SHA-256 value and downloaded .ipk files bypass integrity verification. Exploitation requires an attacker to serve a valid signed index and a forged package of the indexed size while opkg install runs; because opkg runs as root, the payload executes with root privileges.

The record

CVE
CVE-2020-7982
Published
Mar 16, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-754, CWE-345, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-345Insufficient Verification of Data Authenticity
T1557Adversary-in-the-Middle

Public exploit references

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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